Updated on 2024/06/14

写真a

 
URABE Atsushi
 
Organization
Research Institute for Natural Hazards and Disaster Recovery Professor
Title
Professor
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Degree

  • 博士(理学) ( 1994.3   新潟大学 )

Research Interests

  • disaster science

  • geology

Research Areas

  • Natural Science / Human geosciences

Research History (researchmap)

  • Niigata University   Research Institute for Natural Hazards and Disaster Recovery   Professor

    2019.4

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  • Niigata University   Graduate School of Science and Technology Environmental Science and Technology   Professor

    2019.4

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  • Niigata University   Graduate School of Science and Technology Environmental Science and Technology   Associate Professor

    2011.4 - 2019.3

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  • Niigata University   Research Institute for Natural Hazards and Disaster Recovery   Associate Professor

    2011.4 - 2019.3

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  • Niigata University   Research Center for Natural Hazards and Disaster Recovery   Associate Professor

    2007.4 - 2011.3

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  • Niigata University   Research Center for Natural Hazards and Disaster Recovery   Associate Professor (as old post name)

    2006.4 - 2007.3

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  • Niigata University   Associate Professor (as old post name)

    1998.6 - 2006.3

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  • 工業技術院地質調査所科学技術特別研究員   研究員

    1994.10 - 1995.3

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Research History

  • Niigata University   Research Institute for Natural Hazards and Disaster Recovery   Professor

    2019.4

  • Niigata University   Graduate School of Science and Technology Environmental Science and Technology   Associate Professor

    2011.4 - 2019.3

  • Niigata University   Research Center for Natural Hazards and Disaster Recovery   Associate Professor

    2011.4 - 2019.3

  • Niigata University   Graduate School of Science and Technology Environmental Science and Technology   Associate Professor

    2011.4 - 2019.3

  • Niigata University   Research Center for Natural Hazards and Disaster Recovery   Associate Professor

    2007.4 - 2011.3

  • Niigata University   Research Center for Natural Hazards and Disaster Recovery   Associate Professor (as old post name)

    2006.4 - 2007.3

  • Niigata University   Associate Professor (as old post name)

    1998.6 - 2006.3

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Papers

  • 口絵 令和6年能登半島地震による新潟市街部での液状化被害

    Atsushi Urabe, Kyoko Kataoka, Katsuhisa Kawashima, Ryoko Nishii, Naoki Watanabe, Hirofumi Niiya, Takane Matsusmoto, Syun Watabe, Yasuhiro Takashimizu, Norie Fujibayashi, Yasuo Miyabuchi

    The Quaternary Research (Daiyonki-Kenkyu)   2024

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    Publishing type:Research paper (scientific journal)   Publisher:Japan Association for Quaternary Research  

    DOI: 10.4116/jaqua.63.2407i

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  • Crisis hazard assessment for snow-related lahars from an unforeseen new vent eruption: the 2018 eruption of Kusatsu-Shirane volcano, Japan Reviewed

    Kyoko S. Kataoka, Kae Tsunematsu, Takane Matsumoto, Atsushi Urabe, Katsuhisa Kawashima

    Earth, Planets and Space   73 ( 1 )   2021.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    Abstract

    Two-thirds of the 111 active volcanoes in Japan are covered with snow for several months during winter and demonstrate high hazard and risk potentials associated with snow-related lahars during and after eruptions. On 23 January 2018, a sudden phreatic eruption occurred at the ski field on Kusatsu-Shirane (Mt. Motoshirane) volcano, Japan. This new vent eruption from the snow-clad pyroclastic cone required forecasting of future snow-related lahars and crisis hazards zonation of downslope areas including Kusatsu town, a popular tourist site for skiing and hot springs. In order to achieve a prompt hazard assessment for snow-related lahars, a multidisciplinary approach was carried out involving characterization of proximal tephra deposits, snow surveys, and numerical lahar flow simulations using the Titan2D model. To determine the input parameters for the flow model, the consideration of snow water equivalent (SWE) immediately after the eruption (on 29 January) and in the post-eruptive period (on 12 March), was significant. In the case of Kusatsu-Shirane volcano during the winter of 2018, linear relationships between altitude and SWE, obtained at different elevations, were used to estimate the snow volume around the new vents. Several scenarios incorporating snow and snowmelt (water), with or without the occurrence of a new eruption, were simulated for the prediction of future lahars. Three lahar scenarios were simulated, including A) rain-on-snow triggered, B) ice/snow slurry, and C) full snowmelt triggered by a new eruption, and indicated the flow paths (inundation areas) and travel distances. These were useful for lahar hazard zonation and identification of potential high-risk areas. Since the input parameters required for the Titan2D flow model can be relatively easily determined, the model was suitable for the 2018 eruption at Motoshirane where historical and geological lahar records are not available for calibration. The procedure used in the study will enable rapid lahar prediction and hazard zonation at snow-clad volcanoes. Further consideration for simulating a cohesive-type flow, which was predicted by the primary deposits containing large amounts of clay minerals and could not be expressed in the Titan2D flow model, is necessary.

    DOI: 10.1186/s40623-021-01522-0

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    Other Link: https://link.springer.com/article/10.1186/s40623-021-01522-0/fulltext.html

  • Sediment dynamics of an earthquake-induced landslide due to the effects of rainfall and snowmelt: Examination by multi-temporal UAV-SfM survey data Reviewed

    Ken'ichi KOSHIMIZU, Satoshi ISHIMARU, Gentaro KAWAKAMI, Yasutaka NAKATA, Masazo TAKAMI, Atsushi URABE

    Journal of the Japan Society of Erosion Control Engineering   74 ( 3 )   26 - 36   2021

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  • Tsunamis caused by offshore active faults and their deposits

    Yasuhiro Takashimizu, Gentaro Kawakami, Atsushi Urabe

    Earth-Science Reviews   211   103380 - 103380   2020.12

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.earscirev.2020.103380

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  • Diatom assemblages in the 2011 Tohoku-oki tsunami deposits and underlying soil in the Sendai Plain Reviewed

    Yoshiki Sato, Yasuhiro Takashimizu, Atsushi Urabe

    Diatom   36   85 - 91   2020.12

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.11464/diatom.36.85

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  • Consideration on Wide Area Land Subsidence of the Muikamachi Basin by Groundwater Use in Winter Reviewed

    Satoru OHTSUKA, Atsushi URABE, Hiroshi KURITA

    Journal of the Japan Society of Engineering Geology   61 ( 2 )   38 - 49   2020.6

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Engineering Geology  

    DOI: 10.5110/jjseg.61.38

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  • Part 8 Urban ground movement induced by the earthquake and its countermeasures 8.1 Liquefaction damage and valley-filling banking structure in the Satozuka area, Sapporo Reviewed

    Atsushi URABE, Wataru HIROSE, Gentaro KAWAKAMI

    Landslides induced by the 2018 Hokkaido Eastern Iburi Earthquake   248 - 259   2020

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    Authorship:Lead author   Language:Japanese   Publishing type:Part of collection (book)  

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  • Effective camera shooting orientation on UAV−SfM survey for steep cliff slope Reviewed

    KOSHIMIZU Ken’ichi, KAWAKAMI Gentaro, ISHIMARU Satoshi, KOYASU Hiromichi, KASE Yoshihiro, HIROSE Wataru, TAKAHASHI Ryo Takahashi, URABE Atsushi

    Report of the Geological Survey of Hokkaido   91   49 - 53   2020

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    Language:Japanese   Publishing type:Research paper (bulletin of university, research institution)  

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  • Holocene paleoenvironment and relative sea-level change in Ashibe Port, Iki Island, Nagasaki Prefecture, southwestern Japan Reviewed

    Satoshi Sasaki, Toshiaki Irizuki, Atsushi Urabe, Hiroki Hayashi, Koji Seto, Tetsuya Sakai

    Laguna   27   1 - 18   2020

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

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  • 噴砂の磁化による古地震の年代推定-御館山館跡と四方背戸割遺跡において Reviewed

    酒井英男, 泉吉紀, 名古屋岳秀, 野垣好史, 卜部厚志

    情報考古学   24   2019

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  • Examination of tsunami history based on the sediment survey in the Japan Sea side, South-West Japan

    URABE Atsushi

    Report of the Coordinating Committee for Earthquake Prediction   102   420 - 421   2019

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (other academic)  

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  • 新潟県津南町笹葉峰の崩壊地とその周辺の地形・地質

    渡辺 秀男, 渡辺 文雄, 卜部 厚志

    苗場山麓ジオパーク研究集録   43 ( 52 )   2019

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  • 特別天然記念物である古代の魚津埋没林の探査と掘削による新たな発見 Reviewed

    酒井英男, 泉吉紀, 卜部厚志, 石須秀知, 打越山詩子, 麻柄一志

    情報考古学   23   32 - 38   2018

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  • Simple assessment of shallow velocity structures with small-scale microtremor arrays: interval-averaged S-wave velocities Reviewed

    Ikuo Cho, Atsushi Urabe, Tsutomu Nakazawa, Yoshiki Sato, Kentaro Sakata

    Exploration Geophysics   49 ( 6 )   922 - 927   2018

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:CSIRO PUBLISHING  

    This article describes a method for processing microtremor records from a small-scale seismic array that allows interval-averaged S-wave velocities to be estimated for 10-m depth ranges down to a depth of 30 m. The method was applied to microtremor data obtained in the town of Mashiki, Kumamoto Prefecture, Japan, and the analysis results were evaluated through a comparison with available PS logs and sections obtained by surface-wave methods. It turned out that the interval-averaged S-wave velocity estimates may be subject to errors of up to 20-30% in absolute values, but it was shown that the method can help evaluate relative spatial variations in those S-wave velocities. In view of the simplicity of analysis, the analyser-independent nature of the results and the limitations of analysis accuracy, the interval-averaged S-wave velocity estimation method presented here could be used as an effective tool for the preliminary analysis of microtremor data from small-scale seismic arrays.

    DOI: 10.1071/EG18020

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  • Results of All-core Drilling and Trenching Surveys of Liquefied Sediments Associated with the 2011 off the Pacific Coast of Tohoku Earthquake Reviewed

    KOMATSUBARA Taku, MIZUNO Kiyohide, SAITO Masaru, HOSOYA Takashi, URABE Atsushi, MIYACHI Yoshinori, KAZAOKA Osamu

    Journal of Geography (Chigaku Zasshi)   127 ( 3 )   361 - 389   2018

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Tokyo Geographical Society  

    The 2011 off the Pacific coast of the Tohoku earthquake caused severe liquefaction events in the Kanto region, which is 300-400 km south of the earthquake's epicenter. All-core drillings and trenching surveys were carried out at Yodaura and Mukoya, which are situated in the lowland along the lower Tone River in the central Kanto region. The Yodaura site is on reclaimed land where a former lake was filled in by sand pumping from 1969 to 1974. The sediments at Yodaura consisted of silts and clays of the former Lake Yodaura deposits (natural sediments) and sandy strata composed of artificial fill. No evidence was found of liquefaction in the natural deposits, but the artificial-fill deposits suffered severe liquefaction. Three distinct sand dikes (yS1 sand dyke–yS3 sand dyke) cut the artificial strata at Yodaura: yS1 sand dyke, composed of gray, unoxidized sand, reached the ground surface and cut yS2 sand dyke, which was composed of light-brown, oxidized sand. Therefore, two liquefaction events occurred at the same point: the older event, which produced yS2 sand dyke, was probably induced by the 1987 off the east coast of Chiba Prefecture earthquake (<i>M</i>j = 6.7), and the newer one, which produced yS1 sand dyke, was induced by the 2011 earthquake. The third sand dike (yS3 sand dyke) originated in a bed of fine to medium sand containing shell fragments in the artificial strata and contained fragments of asphalt from the ground surface. This dike is consistent with eyewitness accounts of sand gushing during the 2011 event. These accounts report that the ground pulsated at intervals of several seconds, and water and sand spouted from the ground simultaneously with each ground motion pulse. The presence at Yodaura of massive un-stratified sand beds within well-stratified sandy layers, especially near the sand dikes, indicates that liquefaction destroyed the original structure of the sediments. The Mukoya site is on reclaimed land where an abandoned channel of the Tone River was artificially filled in after 1956 by sand pumping and sediment dredging. The surface sediments at the Mukoya site are composed of Holocene floodplain deposits, abandoned channel sediments deposited between 1626 and 1956, and artificial strata. Two distinct deformation structures (mS1 and mS2) were observed in a trench wall. mS1 was a sand dyke that originated in the upper member of the abandoned channel sediments and reached the ground surface. The mS1 sand dyke consisted of liquefied materials derived from the dredged fine to medium sand deposits of the lower part of the artificial strata, and where it was ejected, a “shoulder-like” point formed on the upper surface of the sandy dredged deposits. Structure mS2 was a depression structure in the lower part of the artificial strata that displaced the sandy dredged deposits and an underlying buried soil layer downward. A “sill-like” horizontal sand dike extended from the sandy deposits into the buried soil. In the muddy upper part of the artificial strata, there were many fractures parallel to sand dyke mS1 and the “shoulder” of the sandy dredged deposits. The presence of these fractures indicates that minor subsurface geological structures affected the ground motion and location of liquefied sites caused by the earthquake.

    DOI: 10.5026/jgeography.127.361

    DOI: 10.5026/jgeography.127.357_references_DOI_Ss96ekqlII9MC5v2IFIbZ6YfGVP

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    Other Link: http://id.ndl.go.jp/bib/029135451

  • 2016年熊本地震で甚大な被害を受けた益城町市街地の地下を構成する火山性堆積物の層序と分布形態 Reviewed

    中澤 努, 坂田 健太郎, 佐藤 善輝, 星住 英夫, 卜部 厚志, 吉見 雅行

    地質学雑誌   124   347 - 359   2018

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:日本地質学会  

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  • Results of All-core Drilling and Trenching Surveys of Liquefied Sediments Associated with the 2011 off the Pacific Coast of Tohoku Earthquake Reviewed

    Komatsubara Taku, Mizuno Kiyohide, Saito Masaru, Hosoya Takashi, Urabe Atsushi, Miyachi Yoshinori, Kazaoka Osamu

    JOURNAL OF GEOGRAPHY-CHIGAKU ZASSHI   127 ( 3 )   361 - 389   2018

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:TOKYO GEOGRAPHICAL SOC  

    The 2011 off the Pacific coast of the Tohoku earthquake caused severe liquefaction events in the Kanto region, which is 300-400 km south of the earthquake's epicenter. All-core drillings and trenching surveys were carried out at Yodaura and Mukoya, which are situated in the lowland along the lower Tone River in the central Kanto region. The Yodaura site is on reclaimed land where a former lake was filled in by sand pumping from 1969 to 1974. The sediments at Yodaura consisted of silts and clays of the former Lake Yodaura deposits (natural sediments) and sandy strata composed of artificial fill. No evidence was found of liquefaction in the natural deposits, but the artificial-fill deposits suffered severe liquefaction. Three distinct sand dikes (yS1 sand dyke-yS3 sand dyke) cut the artificial strata at Yodaura: yS1 sand dyke, composed of gray, unoxidized sand, reached the ground surface and cut yS2 sand dyke, which was composed of light-brown, oxidized sand. Therefore, two liquefaction events occurred at the same point: the older event, which produced yS2 sand dyke, was probably induced by the 1987 off the east coast of Chiba Prefecture earthquake (Mj = 6.7), and the newer one, which produced yS1 sand dyke, was induced by the 2011 earthquake. The third sand dike (yS3 sand dyke) originated in a bed of fine to medium sand containing shell fragments in the artificial strata and contained fragments of asphalt from the ground surface. This dike is consistent with eyewitness accounts of sand gushing during the 2011 event. These accounts report that the ground pulsated at intervals of several seconds, and water and sand spouted from the ground simultaneously with each ground motion pulse. The presence at Yodaura of massive un-stratified sand beds within well-stratified sandy layers, especially near the sand dikes, indicates that liquefaction destroyed the original structure of the sediments. The Mukoya site is on reclaimed land where an abandoned channel of the Tone River was artificially filled in after 1956 by sand pumping and sediment dredging. The surface sediments at the Mukoya site are composed of Holocene floodplain deposits, abandoned channel sediments deposited between 1626 and 1956, and artificial strata. Two distinct deformation structures ( mS1 and mS2) were observed in a trench wall. mS1 was a sand dyke that originated in the upper member of the abandoned channel sediments and reached the ground surface. The mS1 sand dyke consisted of liquefied materials derived from the dredged fine to medium sand deposits of the lower part of the artificial strata, and where it was ejected, a "shoulder-like" point formed on the upper surface of the sandy dredged deposits. Structure mS2 was a depression structure in the lower part of the artificial strata that displaced the sandy dredged deposits and an underlying buried soil layer downward. A "sill-like" horizontal sand dike extended from the sandy deposits into the buried soil. In the muddy upper part of the artificial strata, there were many fractures parallel to sand dyke mS1 and the "shoulder" of the sandy dredged deposits. The presence of these fractures indicates that minor subsurface geological structures affected the ground motion and location of liquefied sites caused by the earthquake.

    DOI: 10.5026/jgeography.127.361

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  • Event deposits in Holocene coastal sediments of the southern part of Okushiri Island, Hokkaido

    URABE ATSUSHI, Kase Yoshihiro, Kawakami Gentaro, Nishina Kenji, Koyasu Hiromichi

    Annual Meeting of the Geological Society of Japan   2018 ( 0 )   85 - 85   2018

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    Language:Japanese   Publisher:The Geological Society of Japan  

    DOI: 10.14863/geosocabst.2018.0_85

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  • Records of the tsunami source activity in the Hiyama coastal area, Hokkaido

    Kase Yoshihiro, Urabe Atsushi, Kawakami Gentaro, Nishina Kenji, Koyasu Hiromichi

    Annual Meeting of the Geological Society of Japan   2018 ( 0 )   84 - 84   2018

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    Language:Japanese   Publisher:The Geological Society of Japan  

    DOI: 10.14863/geosocabst.2018.0_84

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  • Compare and contrast tsunami deposits to heights of tsunami waves by numerical simulation around Japan Sea

    NISHINA Kenji, URABE Atsushi

    Annual Meeting of the Geological Society of Japan   2018 ( 0 )   81 - 81   2018

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    Language:Japanese   Publisher:The Geological Society of Japan  

    DOI: 10.14863/geosocabst.2018.0_81

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  • Reconstruction of the 1741 Oshima-Ohshima Tsunami by numerical simulation, historic record and tsunami deposits

    Kawakami Gentaro, Ioki Kei, Yanagisawa Hideaki, Tanioka Yuichiro, Kase Yoshihiro, Nishina Kenji, Hirose Wataru, Koyasu Hiromichi, Urabe Atsushi

    Annual Meeting of the Geological Society of Japan   2018   83 - 83   2018

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    Language:Japanese   Publisher:The Geological Society of Japan  

    DOI: 10.14863/geosocabst.2018.0_83

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  • Reconstruction of tsunami history based on event deposits in the Niigata area, eastern coast of the Sea of Japan Reviewed

    Atsushi Urabe

    QUATERNARY INTERNATIONAL   456   53 - 68   2017.10

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    Although extensive research on tsunami deposits has been conducted on the Pacific coast of Japan, such deposits on the Sea of Japan coast have received little attention. Consequently, little is known about tsunamis along this coastline, especially for events that occurred before the 19th century. The aim of the present study is to enhance this record based on tsunami deposits in Lake Kamo and Iwafune Lagoon in the Niigata area.
    Based on analysis of six borehole cores, twenty-four likely tsunami deposits that formed during the last approximately 9000 years were identified in Lake Kamo, and nine likely tsunami deposits that from between approximately 9000 and 2200 cal BP were identified in Iwafune Lagoon.
    The likely tsunami deposits of Lake Kamo and Iwafune Lagoon have revealed the first detailed tsunami history for the last approximately 9000 years in the northern Sea of Japan. (C) 2017 Elsevier Ltd and INQUA. All rights reserved.

    DOI: 10.1016/j.quaint.2017.05.045

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  • Photogrammetry-based texture analysis of a volcaniclastic outcrop-peel: Low-cost alternative to TLS and automation potentialities using Haar Wavelet and Spatial- Analysis Algorithms Reviewed

    Gomez, C, Kataoka, K.S, Saputra, A. Wassmer, P, Urabe, A, Morgenroth, J, Kato, A

    Forum Geografi (Indonesian Journal of Spatial and Regional Analysis)   31   16 - 27   2017.6

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    DOI: 10.23917/forgeo.v31i1.3977

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  • Crevasse splay deposits of the 2015 Kanto-Tohoku Torrential Rain Disaster in the central part of the Kinu River, Kami-Misaka district, Joso City Reviewed

    Sato Yoshiki, Miyachi Yoshinori, Urabe Atsushi, Komatsubara Junko, Naya Tomonori

    The Quaternary Research (Daiyonki-Kenkyu)   56 ( 2 )   37 - 50   2017

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Association for Quaternary Research  

    <p>The 2015 Kanto-Tohoku Torrential Rain that hit the Kanto and Tohoku regions of eastern Japan from September 9 to September 12, 2015, resulted in a major riverine and slope disaster. Overbanking and breaching occurred along the central part of the Kinu River and formed crevasse splays on the flood plain around Kami-Misaka, Joso City, Ibaraki Prefecture. We clarified the distribution of crevasse splay deposits based on an interpretation of aerial photographs taken just after the disaster and a field survey. In addition, we performed an excavation survey and grain size analysis of the crevasse splay deposit. These resulted in the following findings.</p><p>1) Crevasse splay deposits mainly comprise fine to medium sand and can be divided into the following three units : Unit A, sandy silt to fine sand layer showing upward coarsening ; Unit B, fine to medium sand layer showing upward fining ; and Unit C, fine to medium sand layer with parallel lamination and low-angle cross-stratification.</p><p>2) The difference between these units probably corresponded to the changes in flow conditions during the flooding. Unit A, deposited at the early period of flooding, was derived from heavy rain and overbank of the river water ; Unit B, deposited during hydraulic bore, was generated by the breach of the river bank, flowing down the flood plain ; Unit C was formed by the flooding flow from the Kinu River via the breach point during the flood.</p><p>3) Typical stratigraphy of crevasse splay deposits in this study is characterized by the upward-fining unit (Unit B), which shows a difference from the known flood deposits.</p>

    DOI: 10.4116/jaqua.56.37

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  • 2011年東北地方太平洋沖地震による潮来市日の出地区の液状化被害と液状化層の粒度組成 Reviewed

    卜部厚志, 山本泰士

    地学雑誌   126   731 - 748   2017

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    DOI: 10.5026/jgeography.126.731

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  • Tsunamis and possible tsunamigenic deposits along the eastern margin of the Japan Sea Invited Reviewed

    Kawakami Gentaro, Kase Yoshihiro, Urabe Atsushi, Takashimizu Yasuhiro, Nishina Kenji

    The Journal of the Geological Society of Japan   123 ( 10 )   857 - 877   2017

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Geological Society of Japan  

    <p>Extensive research has been conducted on tsunamigenic deposits along the eastern margin of the Japan Sea since the 2011 Tohoku Earthquake and tsunami. This paper reviews the characteristics of the large known tsunamis and the possible tsunamigenic deposits identified in this region. We have also reconstructed the spatio-temporal distribution, and a provisional correlation, of the tsunamigenic deposits in order to estimate the tsunami recurrence intervals and their wave source regions.</p><p>Most of the tsunamigenic deposits were recognized in peaty and marshy deposits found on swales of coastal dunes, flood plains, and small valley plains. Large numbers of tsunamigenic sandy layers were also identified in lagoonal deposits. In addition, some gravelly deposits of possible tsunamigenic were recognized on top of low-lying marine terraces and slope talus.</p><p>Although several historical tsunamis in the 18-19th centuries have been recorded along the eastern margin of the Japan Sea, there are few localities where deposits can be correlated to these records. Tsunamigenic deposits suggest that four tsunami events have occurred during the 9-14th centuries, despite there being limited historical records of tsunamis older than the 18th century. The distribution of these four deposits is as follows: 14th century = Aomori-northern Yamagata; 12th century = southwestern Hokkaido; 11th century (?1092 AD) = Sado/Niigata-southern Yamagata; 9th century (?850 AD) = (Sado)-Yamagata-Aomori. These events are also recorded in the deep-sea Japan Basin as seismo-turbidites. Most tsunamigenic deposits older than the 9th century have only been identified at remote islands (Okushiri, Tobishima, and Sado).</p><p>Several unanswered research questions on these tsunamigenic deposits remain, such as robust identification of the origins and precise ages of the deposits. Our work provides a framework for future screening of potential tsunamigenic deposit data and an improved understanding of paleotsunami events along the eastern margin of the Japan Sea.</p>

    DOI: 10.5575/geosoc.2017.0054

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  • 富山湾沿岸地域における潟湖の成立年代-貝塚および低湿地遺跡の成立に関して- Reviewed

    卜部厚志, 酒井英男, 麻柄一志

    大境   36   32 - 41   2017

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  • Millennial-scale reworking of tephra in alluvial to shallow marine settings: Distinguishing pseudo-isochrons from genuine ones Reviewed

    Kyoko S. Kataoka, Atsushi Urabe, Yoshitaka Nagahashi

    QUATERNARY INTERNATIONAL   397   173 - 193   2016.3

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    Primary tephra layers can provide isochrons in a stratigraphic sequence. Such isochrons are powerful tools in terms of correlation and chronology of strata, and they constrain a chronological framework for geology, geomorphology, archaeology and palaeo-environmental studies in the Neogene to Quaternary. However, reworking processes can re-distribute tephra materials in both time and space, so that a given tephra can form a new discrete layer later in the depositional sequence, or it can be distributed in low concentrations (no visible layers, i.e., crypto-tephras) over a range of different stratigraphic horizons. The present study, based on sedimentological, petrographical, and geochemical analyses of reworked tephras in Japan, evaluates the duration and persistence of reworking and the tephra mobilisation and delivery to watersheds. Furthermore, it discusses how a unique isochron can be constructed from tephra distribution in a sedimentary sequence. Examples presented here are from fluvial and deltaic sequences in the Japanese Quaternary, which contain several visible tephra layers and a certain amount of tephra materials from multiple sources at different stratigraphical horizons. In the Niigata Plain, 5.4 ka Numazawako tephra material continued to be reworked for more than 4000 years after the eruption of Numazawa volcano, and was re-deposited as reworked pumice grains consisting of a "visible" tephra layer in delta front deposits. Mixed tephra materials originating from an earlier eruption of Numazawa volcano and eruptions from other calderas were also identified. In the Tsugaru Plain, post-2.5 ka subsurface deposits have &gt; 10% glass shards content throughout the sequence. Glass shards were derived from several different tephra materials, such as those from the most recent eruption of Towada volcano (AD 915), and earlier caldera forming eruptions (30 ka, 15 ka). Some of the glass shards probably originated from erosion of exposed Pliocene pyroclastic bedrock. Thus, tephra reworking processes in alluvial to shallow marine settings can continue long after an eruption has ended, and can persist even during inter-eruptive (i.e., background sedimentation) periods. As tephra reworking involves complicated processes, careful observation and interpretations are necessary to evaluate whether tephra materials can truly provide an isochron for the strata in which they are found to exist. (C) 2015 Elsevier Ltd and INQUA. All rights reserved.

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  • Tsunami deposits recognized in Okushiri Island, southwestern Hokkaido, Japan Reviewed

    Kase Yoshihiro, Koshimizu Ken'ichi, Tajika Jun, Ohtsu Sunao, Urabe Atsushi, Okazaki Noritoshi, Fukami Hiroshi, Ishimaru Satoshi, Nishina Kenji, Kawakami Gentaro, Hayashi Keiichi, Takashimizu Yasuhiro, Hirose Wataru, Sagayama Tsumoru, Takahashi Ryo, Watanabe Tatsuya

    The Journal of the Geological Society of Japan   122 ( 11 )   587 - 602   2016

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    <p>Okushiri Island, located in southwest Hokkaido, Japan, was hit by an earthquake-generated tsunami in July 1993. An excavation survey revealed several event sand beds, interbedded with peaty sediments, in the lowland at the southernmost part of the island. These beds consist of relatively well-sorted fine- to medium-grained sand similar to sandy shoreline deposits; they are normally graded, fining and thinning landwards. Some beds show partial erosional bases and ripple cross-laminations, implying landward-directed paleocurrents, and grain fabrics also indicate the landward dispersal of clastics. The sand beds yield marine organic-walled microfossils such as dinoflagellate cysts and foraminiferal linings. These findings indicate that the sand beds are of tsunami origin. The results of carbon-14 dating and tephrochronology indicate that at least six tsunami events, including the AD 1741 Oshima-Ohshima and the AD 1993 Hokkaido Nansei-Oki tsunamis, have hit the island over the past 3000-4000 years.</p>

    DOI: 10.5575/geosoc.2016.0042

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  • 南関東各遺跡の富士-河村城スコリア(Fj-Kw)対比候補--Fj-Kw:1590年直後に富士山から噴出した新発見テフラ-- Reviewed

    上本進二, 上杉 陽, 卜部厚志

    関東の四紀   35   37 - 55   2016

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  • 新潟地域における小・中学生にむけた防災教育の取り組み Reviewed

    卜部厚志

    第四紀研究   55   169 - 174   2016

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  • (Cancel) Paleo-tsunami deposits intercalated in Holocene marine terrace of Tobishima Island on the Japan Sea Eastern Margin Mobile Belt

    Takashimizu Yasuhiro, Ono Katsunori, Urabe Atsushi, Nishina Kenji, Kawakami Gentaro, Hirakawa Kazuomi

    Annual Meeting of the Geological Society of Japan   2016 ( 0 )   351 - 351   2016

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    This presentation has been canceled on the day of the Annual Meeting. Please don't quote this Abstract.

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  • Vertical distribution of organic-walled microfossils in the Tsunami deposit.

    Hayashi Keiichi, Kase Yoshihiro, Urabe Atsushi, Takashimizu Yasuhiro, Kawakami Gentaro, Nishina Kenji

    Annual Meeting of the Geological Society of Japan   2016 ( 0 )   37 - 37   2016

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  • Differences of distributions patterns between tsunami gravels and storm gravels on a surface of storm swash terraces

    Nishina Kenji, Kawakami Gentaro, Kase Yoshihiro, Hirose Wataru, Urabe Atsushi, Takashimizu Yasuhiro, Hirakawa Kazuomi

    Annual Meeting of the Geological Society of Japan   2016 ( 0 )   36 - 36   2016

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  • Features of tsunami deposits analyzed by inorganic geochemistry

    Kase Yoshihiro, Kawakami Gentaro, Nishina Kenji, Hayashi Keiichi, Urabe Atsushi, Takashimizu Yasuhiro

    Annual Meeting of the Geological Society of Japan   2016 ( 0 )   38 - 38   2016

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  • Event deposit of the alluvial sediments in the coastal area of Toyama Bay

    Urabe Atsushi, Takashimizu Yasuhiro, Suzuki Kouji, Kataoka Kyoko, Nishina Kenji, Kawakami Geotaro, Hirakawa Kazuomi, Sakai Hideo

    Annual Meeting of the Geological Society of Japan   2015   321 - 321   2015

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  • 磁気ファブリックと粒度特性を用いた名取川河口左岸域における2011年東北地方太平洋沖地震津波の挙動 Reviewed

    澁谷剛丈, 髙清水康博, 卜部厚志, 鈴木幸治

    堆積学研究   73   3 - 17   2014

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  • An Evaluation of the Uncertainty on the Investigation Results by Using Evidential Support Logic Reviewed

    Akio NAKAYASU, Ryosuke DOKE, Tadafumi NIIZAT, Atsushi URABE, Eisuke ONO

    Geoinformatics   25 ( 4 )   189 - 203   2014

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  • 新潟県佐渡市加茂湖におけるイベント堆積物 Reviewed

    卜部厚志

    佐渡の自然史   2   67 - 78   2014

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  • A new Miocene three-spined stickleback (Pisces: Gasterosteidae) from Central Japan Reviewed

    Mikhail V. Nazarkin, Yoshitaka Yabumoto, Atsushi Urabe

    PALEONTOLOGICAL RESEARCH   16 ( 4 )   318 - 328   2013.1

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    Gasterosteus kamoensis sp. nov. is described from the Upper Miocene Minamiimogawa Formation in Kamo City, Niigata, Japan. The new species represents the oceanic complete morph. It is characterized by: short and high ectocoracoid; presence of posttemporal bone; fully developed pelvic girdle with convex anterior margin; wide and not tapering posterior process of pelvic bone; four dorsal spines; comparatively long spines in dorsal, pelvic and anal fins; and large body size, apparently exceeding 130 mm in standard length. Gasterosteus kamoensis sp. nov. is the third nominal fossil species of this genus described from East Asia, along with freshwater G. orientalis Sytchevskaya and the marine G. abnormis Gretchina. Together, these discoveries demonstrate the wide distribution and morphological and ecological diversity of this genus during the Miocene in the northwestern Pacific.

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  • Correlation of tephra beds in peaty bog sediments on the summit of Mt. Naebasan, central Japan Reviewed

    Urabe Atsushi, S. Kataoka Kyoko

    The Quat. Res.   52 ( 6 )   241 - 254   2013

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    Twelve tephra beds (NB1 to NB12) are identified in peaty bog sediments on the summit of Mt. Naebasan, central Japan. Radiocarbon data from the sediments shows that the peaty deposits and tephra beds were deposited during the Holocene. On the basis of petrographic characteristics, refractive index, and chemistry of glass shards, the following correlation with previously reported tephras is suggested : NB3 tephra with Kikai-Akahoya tephra mixed with Myoko-Akakura tephra ; NB8 with Kusatsu-Shirane-Kumakura pumice ; NB10 with Kusatsu sp1-3 tephra ; NB11 with Myoko-Otagirigawa tephra ; and NB12 with Koyaike volcanic ash group C. Glass shard chem- istry suggests that the remaining uncorrelated tephra layers were probably derived either from Asama, Kusatsu-Shirane, Myoko, or Niigata-Yakeyama volcanoes.

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  • Deposition by the 2011 Tohoku-oki tsunami on coastal lowland controlled by beach ridges near Sendai, Japan Reviewed

    Yasuhiro Takashimizu, Atsushi Urabe, Koji Suzuki, Yoshiki Sato

    SEDIMENTARY GEOLOGY   282   124 - 141   2012.12

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    A study of the 2011 Tohoku-oki tsunami deposits on the coastal lowland of the Sendai Plain, Japan was carried out along a shore-perpendicular survey line in the Arahama area. Field descriptions and tsunami water depth measurements were complemented by sedimentary analyses, including grain size, grain fabric and diatom analysis. The tsunami deposits show a generally fining-inland trend along the 3.4 km long transect. The depositional facies, grain size analysis and grain fabric data suggest that most of the tsunami deposits were laid down during the tsunami inflow, except at one site. These tsunami deposits are characterized by parallel-laminated or massive sand and silt with pieces of woods, fragments of glass, rip-up mud clasts and an erosional base. Minor backwash deposits overlying the inflow sand layer were only observed on one beach ridge and attributed to the topographic high. Marine diatom species comprised only approximately 2% of the diatom assemblage in tsunami deposits and their content decreased landward. In this study, diatom assemblages were similar in the rice field soil and tsunami layers, suggesting that the muddy fraction of the deposits mainly consists of sediments derived from the tsunami-eroded rice field soil. As a result of soil erosion, the tsunami had a high suspended sediment load. Furthermore, after the first tsunami inundation, seawater left by the tsunami did not drain completely to the sea because of the high coastal beach ridge and/or coastal subsidence due to the massive earthquake. Therefore, strong tsunami outflows to the sea did not occur and these areas were covered by mud deposited from stagnant water. (c) 2012 Elsevier B.V. All rights reserved.

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  • 2011年度(平成23年度)東北地方太平洋沖地震に伴う津波堆積物の緊急調査速報:仙台平野を遡上した津波による堆積物の例

    高清水康博, 卜部厚志, 鈴木幸治

    Annual Report of Resarch Institue for Natural Hazards and Disaster Recovery, Niigata University   ( 1 )   79 - 80   2012.10

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  • Re-examination of the damage distribution and the source area of the 1751 Takada Earthquake Reviewed

    YATA Toshifumi, URABE Atsushi

    The study of primary sources   ( 8 )   1 - 23   2011.3

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  • 北陸の地体構造と地震・地震災害--これからの地震防災に向けて-- Reviewed

    竹内 章, 平松良浩, 卜部厚志

    地盤工学会誌   59 ( 2 )   8 - 11   2011

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  • Influence of a volcanogenic flood event on an alluvial depositional system: the Holocene Echigo Plain of northeast Japan Reviewed

    Urabe Atsushi, Fujimoto Yusuke, Kataoka Kyoko S.

    Jour. Geol. Soc. Japan   117 ( 9 )   483 - 494   2011

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    The Echigo Plain, which faces the Sea of Japan in northeast Japan, is a typical coastal plain with numerous sand dunes. We examined the sedimentology of pumiceous sediments (lahar deposits) in the Agano River area of the Echigo Plain, derived mainly from a large-scale dam-break flood after the Numazawako eruption (about 5 ka), using an existing borehole dataset and facies analysis of sediment cores.<br>The lahar deposits show different sedimentary facies in coastal areas versus the shallow marine environment. Coarse-grained pumiceous sediments (5—8 m thick) are interpreted to have been deposited under the delta front or in a delta plain environment in a coastal area. Sandy silt deposits (pro-delta facies), including pyroclastic material (horizons of concentrated volcanic glass shards and heavy minerals), are distributed in the shallow sea area.<br>The large volumes of volcaniclastic sediment delivered during the flood event induced the rapid progradation of the delta system in the Agano River region. The deposition of volcaniclastic sediments in the shallow sea also caused progradation of the delta system and changed the coastal landforms along the margin of the Echigo Plain.<br>The flood event resulted in an increase in the progradation rate of the depositional system from 0.9 to 2.5 km per 1000 years. An understanding of large-scale pyroclastic resedimentation can contribute to evaluating and predicting the volume of sediment discharge and the nature of hazards created by a volcanogenic flood and its aftermath in an alluvial plain setting.

    DOI: 10.5575/geosoc.117.483

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  • Sedimentary facies and accumulation rate of the incised-valley fills in the Echigo Plain, central Japan

    Funabiki Ayako, Miyachi Yoshinori, Urabe Atsushi, Kamoi Yukihiko

    Annual Meeting of the Geological Society of Japan   2011   339 - 339   2011

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    DOI: 10.14863/geosocabst.2011.0.339.0

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  • 1828年三条地震における与板町の被害

    矢田俊文, 卜部厚志

    災害と資料   ( 4 )   2010.3

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  • Re-examination of the damage distribution and the source area of the 1828 Sanjo Earthquake Reviewed

    YATA Toshifumi, URABE Atsushi

    The study of primary sources   ( 7 )   1 - 14   2010.3

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  • Holocene activity of the Kakuda-Yahiko fault in the western margin of the Niigata Plain, based on sediment core analysis Reviewed

    Nakanishi Toshimichi, Miyachi Yoshinori, Tanabe Susumu, Urabe Atsushi, Yasui Satoshi, Wakabayashi Toru

    Active Fault Research   32 ( 32 )   9 - 25   2010

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    The Kakuda-Yahiko fault is a west-dipping blind thrust along the western margin of the Niigata plain, central Japan. The slip rate has not clearly estimated because the fault is buried under thick sediments. We obtained and analyzed three core samples (GS-KNM-1, GS-SGT-1, and AK-1) crossing the fault, and we recognized the Holocene vertical movement on the basis of correlation of detailed description, radiocarbon ages, and diatom assemblages. Based on these analyses, we interpreted nine sedimentary facies: the late Pleistocene marine sediments, meandering river sediments, salt to freshwater marsh sediments, offshore sediments, lower and upper shoreface sediments, foreshore sediments, modern river sediments, dune sediments, and surface soils, in ascending order. The average vertical-slip rate is estimated 3.6-4.6 mm/yr based on the vertical-offsets of the ravinement surface dated 9.4-8.2 cal kyr BP and the pumice layer dated 6-5 cal kyr BP. However, this slip rate might contain at best 1.3 mm/yr compaction effects of unconsolidated muddy sediments. Therefore, the average vertical-slip rate of Kakuda-Yahiko fault would be estimated about 3 mm/yr.

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  • Seamless geo-information of the "Chuseki-so" across coastal zone of Niigata Plain, central Japan.

    MIYACHI Yoshinori, URABE Atsushi, INOUE Takuhiko, AMANO Atsuko, KAGOHARA Kyoko, FUNABIKI Ayako, KIMURA Katsumi

    Annual Meeting of the Geological Society of Japan   2010   83 - 83   2010

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  • Borehole log database and shallow-level geologic model in the Niigata Plain

    Funabiki Ayako, Kimura Katsumi, Miyachi Yoshinori, Urabe Atsushi, Kamoi Yukihiko

    Annual Meeting of the Geological Society of Japan   2010   349 - 349   2010

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  • Impacts of explosive volcanism on distal alluvial sedimentation: Examples from the Pliocene-Holocene volcaniclastic successions of Japan Reviewed

    Kyoko S. Kataoka, Vern Manville, Takeshi Nakajo, Atsushi Urabe

    SEDIMENTARY GEOLOGY   220 ( 3-4 )   306 - 317   2009.10

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    Volcanic activities can create cataclysmic hazards to surrounding environments and human life not only during the eruption but also by hydrologic remobilisation (lahar) processes after the cessation of eruptive activity. Although there are many studies dealing with the assessment and mitigation of volcanic hazards, these are mostly concentrated on primary eruptive processes in areas proximal to active volcanoes. However, the influence of volcaniclastic resedimentation may surpass the impacts of primary eruptive activity in terms of both extent and persistence, and can ultimately result in severe hazards in downstream areas.
    Examination of the volcaniclastic successions of non-marine Pliocene-Holocene sedimentary basins in Japan has revealed hydrological volcaniclastic sedimentation in fluvial and lacustrine environments hundreds of kilometres from the inferred source volcano. Impacts on these distal and often spatially separated basins included drastic changes in depositional systems caused by sudden massive in fluxes of remobilised pyroclastic material. Typical volcaniclastic beds comprise centimetre-to decimetre-thick primary pyroclastic fall deposits overlain by metre- to 10s of metres-thick resedimented volcaniclastic deposits, intercalated in sedimentary successions of non-volcanic provenance. The relatively low component of primary pyroclastic fall deposits in the volcaniclastic beds suggests that: 1) potential volcanic hazards would be underestimated on the basis of primary pyroclastic fall events alone; and 2) the majority of resedimented material was likely derived from erosion of non-welded pyroclastic flow deposits in catchment areas rather than remobilisation of local fallout deposits from surrounding hillslopes.
    The nature, distribution and sequence of facies developed by distal volcaniclastic sediments reflect the influence of: 1) proximity to ignimbrite, but not directly with the distance to the eruptive centre; 2) ignimbrite nature (non-welded or welded) and volume; 3) temporal changes in sediment flux from the source area; 4) the physiography and drainage patterns of the source area and the receiving basin, and any intervening areas; and 5) the formation of ephemeral dam-lakes and intra-caldera lakes whose potential catastrophic failure can impact distal areas. Models of the styles and timing of distal volcaniclastic resedimentation are thus more complicated than those developed for proximal settings of stratovolcanoes and their volcaniclastic aprons and hence present different challenges for hazard assessment and mitigation. (C) 2009 Elsevier B. V. All rights reserved.

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  • The Budokubo Collapse Basin on the Latest Pleistocene in relation with the 2004 Mid-Niigata Earthquake, central Japan

    Neotectonic Research Group of the Niigata Shinano River Region, Neotectonic Research Group of the Niigata Shinano River Region

    Earth Science (Chikyu Kagaku)   63 ( 3 )   167 - 181   2009

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    This paper presents the results of detailed studies of the Budokubo Collapse Basin, which was formed in the Latest Pleistocene. The basin is located in the northern part of Uonuma Hills, attacked by the 2004 Mid-Niigata Earthquake. The basin is surrounded by hills, and the topography of the basin is a polygon, 2km long and 1.5km wide. The Budokubo Formation within the basin is composed of irregularly alternating beds of gravels, sands and silts, intercalated with the Aira Tn tephra bed (AT; approx. 2.6〜2.9ka). The formation contains peat layers which characterized static slack - water environments. The marginal facies of the Budokubo Formation are poorly sorted, and the formation is in high-angle unconformable contact with Neogene basement. The investigation reveals that just before the Budokubo Collapse Basin was formed, the main stream of the Shinano River had run through the area studied. Four step fluvial terraced surfaces are recognizable in the basin. The forming process of the Budokubo Collapse Basin is considered as follows: At first, we estimate the land was uplifted more than 25m, in a larger area containing the studied area that included the Shinano River, so, the stream had its way blocked and took another course. Later, the land collapsed approximately 25m in this small area called Budokubo. The process and the scale of the Budokubo Collapse Basin are almost the same as those of the Tamugiyama Collapse Basin, about 5km south of the Budokubo Collapse Basin, an area reported on in 2006. Moreover, these basins were formed during the same period. These facts suggest that the upheaval movement preceding the collapse movement occurred in a wide range of the region including the two basins. The region is inferred to contain Yamamotoyama Block and the place where the Uono River joins the Shinano River, which are near the two basins. In the Yamamotoyama Block, the land has been vigorously uplifted since the Latest Pleistocene. Along the junctions of the smaller blocks within the uplifted region both rivers obviously wind their way. These phenomena apparently resulted from active movements like upheaval in this region. The geodetic survey data by the Geographical Survey Institute indicate that the area of the Budokubo Collapse Basin corresponds to the highest uplifted segment in the 2004 Mid-Niigata earthquake. The eleven step fluvial terraced surfaces show that active and intermittent upheaval movements repeatedly followed from the Late Pleistocene to Holocene in this area. Therefore, this sequence of active movements in this region appears to follow the 2004 Mid-Niigata earthquake.

    DOI: 10.15080/agcjchikyukagaku.63.3_167

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  • Breakout flood from an ignimbrite-dammed valley after the 5 ka Numazawako eruption, northeast Japan Reviewed

    Kataoka, K, Urabe, A, Manville, V, Kajiyama, A

    Geological Society of America, Bulletin   120 ( 9/10 )   1233 - 1247   2008.9

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  • Holocene depositional systems along the Agano River of the Echigo Plain, central Japan Reviewed

    Urabe Atsushi

    The Quaternary Research   47 ( 3 )   191 - 201   2008.7

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    The Echigo Plain facing the Sea of Japan is a typical coastal plain covered by coastal sand dunes. Depositional systems along the lower Agano River have been clarified by the facies analysis of borehole datasets and by four newly obtained sediment cores. The upper parts of the alluvium in this area have been formed as a delta system with strong influence of the Agano River. This system is in contrast with a barrier-lagoon system, the subsiding area along the Shinano River in the Echigo Plain. Therefore, it is evident that the alluvium of the Echigo Plain has been formed by the progradation of two different depositional systems, a delta system under the influence of the Agano River and barrier-lagoon system under the impact of the Shinano River.

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  • 2007年新潟県中越沖地震による建物被害と地盤災害

    卜部厚志, 高濱信行, 河島克久, 鈴木幸治, 和泉薫, 福留邦洋, 梶壮志, 本田孝子

    新潟大学災害復興科学センター年報   ( 2 )   135 - 163   2008.7

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  • Volcaniclastic resedimentation after the 50 ka ignimbrite eruption of Numazawa volcano along the Tadami and Agano Rivers, northest Japan

    baba ayaka, urabe atsushi, kataoka kyoko.s

    Annual Meeting of the Geological Society of Japan   2008   423 - 423   2008

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    DOI: 10.14863/geosocabst.2008.0.423.0

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  • The tectonic movement recognized in landform and sedimentation process of alluvial plain in the Niigata region

    urabe atsushi

    Annual Meeting of the Geological Society of Japan   2008   116 - 116   2008

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  • Holocene diatom floras and environmental changes of lagoon-lake deposits in the northern Echigo Plain, central Japan Reviewed

    YASUI Satoshi, FUJITA Tsuyoshi, KIMURA Hiroshi, WATANABE Isamu, YOSHIDA Mamiko, URABE Atsushi

    Earth Scien   61 ( 1 )   49 - 62   2007.12

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    A detailed diatom analysis of one drilling core was carried out in the Fukushima-gata Lagoon area of the northern part of the Echigo Plain, which is situated in the inlet side of the Kitakanbara-gata Lagoon. 11 diatom divisions were detected and correlated with divisions of the Shiunji-gata Lagoon area (Yasui et al. 2002) situated in the inside part of the Kitakanbara-gata Lagoon. The characteristics of diatom assemblages and Holocene sedimentary environments of the Kitakanbara-gata Lagoon are discussed in this paper. Diatom assemblages of the Kitakanbara-gata Lagoon were characterized by flourish or decline of several maker planktonic species. In the Fukushima-gata Lagoon area three types of diatom assemblage appeared repeatedly. The first type is dominated by Aulacoseira granulata, which indicates limnophilous fresh surface water, and may be caused by a closure of an inlet. The first type took the place of the second type dominating by Cyclotella caspia, which is caused by an inflow of marine water from an inlet opening. The third type is characterized by a low frequency of planktonic species, which indicates rheophilous fresh surface water or a reduction of water area. The Holocene sedimentary environments of the Kitakanbara-gata Lagoon are identified as follows on the basis of diatom divisions and ^<14>C datings. The Kitakanbara-gata Lagoon was under a brackish lake environment in ca. 8,000 yrs BP, and three periods of marine surface water expansion occurred at ca. 6,500, from ca. 6,000 to ca. 5,000 and at 3,500 yrs BP. In ca. 3,000 yrs BP, the connection of the water area between Fukushima-gata Lagoon and Shiunji-gata Lagoon areas in the Kitakanbara-gata Lagoon were disappeared.

    DOI: 10.15080/agcjchikyukagaku.61.1_49

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  • Seismic damage of the Noto Hanto Earthquake in 2007, Ishikawa Prefecture, central Japan(Photo)

    URABE Atsushi, TAMURA Keiko, SUZUKI Kouji, TAKAHAMA Noubyuki

    Earth Science (Chikyu Kagaku)   61 ( 3 )   171 - 172   2007

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    DOI: 10.15080/agcjchikyukagaku.61.3_171

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  • Upper Pleistocene to Holocene stratigraphy in the Higashi-Niigata gas field, central Japan - The characteristics and sources of maker pumice beds -, Reviewed

    URABE Atsushi, YASUI Satoshi, INABA Mitsuru, KATAOKA Kyoko, TAKAHAMA Nobuyuki, MITSUDA Shinichi

    Journal of the Japanese Association for Petroleum Technology   71   337 - 348   2006.12

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    DOI: 10.3720/japt.71.337

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  • 堆積相と全有機炭素・窒素・イオウ濃度を用いた堆積環境の復元-新潟平野上部更新統?完新統の例- Reviewed

    吉田真見子, 保柳康一, 卜部厚志, 山崎 梓, 山岸美由紀, 大村亜希子

    地質学論集   59   93 - 109   2006.12

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  • The Collapse Basin on the Latest Pleistocene - Tamugiyama Collapse Basin in the northern part of Uonuma Hills, central Japan -, Reviewed

    Neotectonics Research Group of, the Niigata Shinano River Region, Takahama Nobuyuki, Urabe Atsushi

    Earth Scien   60 ( 6 )   465 - 479   2006.12

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    This paper shows that the Tamugiyama Basin was formed during the Latest Pleistocene by repeated uplift and collapse fault activities. The Tamugiyama Collapse Basin is the youngest one, has ever been reported collapse basins in the Japanese Islands. The Tamugiyama Collapse Basin is located in the northern part of Uonuma Hills, and is attacked by the 2004 Niigata Chuetsu earthquake. The lozenge-shaped basin, about one to two kilometers wide, is surrounded by hills composed of the Pliocene basement. The Tamugiya Formation within this collapse basin is in high-angle abut unconformity contact with Pliocene basement. Talus deposits are recognized on the unconformities. The deposits are resulted from fault scarp and its ancient slope failures. The Tamugiyama Formation is composed of irregularly alternating beds of gravels, sands and silts, intercalated with the Aira Tn tephra bed (AT) about 26,000〜29,000 years ago. The formation contains peat layers, which characterize static slack-water environments. The Kowakita Formation, underlying the Tamugiyama Formation, consists of fluvial gravels carried by the Uono River, therefore it suggests that there was once the ancient Uono River running through this area. The rapid change in sedimentary environments, from the Kowakita formation to the Tamugiyama Formation, results from uplift, faulting and collapse caused by tectonic block movements in this area. The Uono River had changed its course by fault activity and uplift just before the Tamugiyama Collapse Basin was formed, not by subsidence of the present Uono River course. The Yamamotoyama tectonic block including this study area has been the most active uplift block in the Shinano Valley since the Late Pleistocene. The 2004 Niigata Chuetsu earthquake occurred in areas characterized by the same geological setting.

    DOI: 10.15080/agcjchikyukagaku.60.6_465

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  • Development process of barrier-lagoon system in the Holocene sediments of the Echigo Plain, central Japan Reviewed

    URABE Atsushi, YOSHIDA Mamiko, TAKAHAMA Nobuyuki

    Memoirs of the Geological Society of Japan   59   111 - 127   2006.12

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  • Fan deposits amplifying ground motions by the 2004 Mid-Niigata Prefecture earthquake: An example from the Tamugiyama basin, Kawaguchi Town, Niigata Prefecture, central Japan Reviewed

    KOMATSUBARA Taku, NAKAZAWA Tsutomu, MIYACHI Yoshinori, NAKASHIMA Rei, YOSHIMI Masayuki, URABE Atsushi

    Journal of the Geological Society of Japan   112 ( 3 )   188 - 196   2006.12

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    The Tamugiyama district in Kawaguchi Town, Niigata Prefecture is one of the most affected areas by the 2004 Mid-Niigata Prefecture earthquake. Though this district is located in a small (ca. 2 km<sup>2</sup>) basin, some colonies were damaged lightly and others severely. The worst-hit colony is located on the central part of the Tamugiyama fan underlain by thick (ca.20 m) muddy deposits with the N-values ranging from 5 to 20. On the other hand, lightly damaged colonies are located on the Tamugiyama-IV terrace underlain by gravel rich deposits with the N-values of over 50 and on the marginal area of the Tamugiyama fan. The Tamugiyama fan deposits were supplied from surrounding hill areas where weakly consolidated Pliocene to Lower Pleistocene sedimentary rocks occurred and a large number of landslides are recognized. The deposits filled a basin-like incised valley during the latest Pleistocene time. The close relationship between damages and thickness of the muddy fan deposits indicates that the fan deposits intensely amplified ground motions resulting in local severe damages. This fact is noteworthy for making seismic hazard maps.<br>

    DOI: 10.5575/geosoc.112.188

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  • Facies and geomorphic analyses of resedimented volcaniclastic deposits: post-eruptive volcanogenic floods and hazards Invited

    Kataoka, K.S, Urabe, A, Kajiyama, A, Manville, V

    Earth Monthly   28 ( 8 )   507 - 511   2006.8

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  • O-220 Liquefaction damage on high-water channel of the Shinano River, induced by the Niigata Chuetsu Earthquake in 2004, Niigata, Japan

    HONGO Misao, KATAOKA Kyoko S., URABE Atsushi, Suzuki Koji

    Annual Meeting of the Geological Society of Japan   2006   153 - 153   2006

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    DOI: 10.14863/geosocabst.2006.0_153_1

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  • O-26 Two depositional systems formed coastal sand dune in the Echigo Plain, northeast Japan

    URABE Atsushi

    Annual Meeting of the Geological Society of Japan   2006   56 - 56   2006

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    DOI: 10.14863/geosocabst.2006.0_56_2

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  • Flood Disaster along Kariyata River Caused by Heavy Rainfall on July 13, 2004, Niigata Prefecture, Central Japan - The Relation of the Current Processes of the Flood to the Landforms -, Reviewed

    HIRAMATSU Yukiko, YASUI Satoshi, URABE Atsushi, HONGO Misao

    Journal of the Japan Society of Engineering Geology   46 ( 3 )   153 - 161   2005.12

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    A huge flood disaster was caused by a heavy rainfall around the Chuetsu area of Niigata Prefecture on July 13, 2004. The flood breached the levees in many places along Ikarashi-, Kariyata-, and Chigoshimizu Rivers, so that many houses were swept away and wide areas were under muddy flood water in Sanjo and Mitsuke Cities and Nakanoshima Town. In this study, we describe the damages sustained by the flood in Nakanoshima Town area and the southern area of Mitsuke City along Kariyata River, and discuss the current processes of the flood at these areas. It is clear that a surge of the flood attacked houses near by the point of levee breach at Nakanoshima Town, judging from the evidences such as the directions of scours and the traces of flood current toward the houses. The preferred orientations of inclined or fell-down houses, traffic signs, fens, etc., indicated the direction change of flood current. Though the primary surge ran powerfully toward southwest, the flood flowed westward being led to the lower topography until the direction changed toward northwest by an obstruction of natural levee. On the other hand, in the southern area of Mitsuke City, the flood current direction was restricted so much by the narrow valley plain that its flood strength increased much more. As the levee of Chigoshimizu River also breached, the older levee, which remained between the present one and fluvial terrace, was collapsed immediately. The flood current did not only lose its power when it had reached at the lowest terrace but also run up beyond the terrace and destroyed some houses standing on it.

    DOI: 10.5110/jjseg.46.153

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  • 山古志地域の地震被害 Reviewed

    卜部厚志, 高浜信行, 本郷美佐緒, 鈴木幸治, 片岡香子, 安井 賢

    地団研専報   54   60 - 67   2005.12

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  • 小千谷・川口地域の地震被害 Reviewed

    荒川勝利, 堀川秀夫, 山崎興輔, 吉越正勝, 卜部厚志, 高浜信行, 本郷美佐緒, 片岡香子, 鈴木 幸治, 安井 賢, 川辺孝幸

    地団研専報   54   68 - 77   2005.12

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  • The change of depositional system by event sedimentation in the Niigata Plain, northeast Japan

    URABE Atsushi, KATAOKA Kyoto

    Annual Meeting of the Geological Society of Japan   2005   107 - 107   2005

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    DOI: 10.14863/geosocabst.2005.0_107_1

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  • Sedimentology and paleohydrology of a large-scale volcanogenic flood, in the Numazawako eruption aftermath, northeast Japan

    Kataoka Kyoko S., Urabe Atsushi, Kajiyama Atsushi, Manville Vern

    Annual Meeting of the Geological Society of Japan   2005   251 - 251   2005

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    DOI: 10.14863/geosocabst.2005.0_251_2

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  • Earthquake hazards and property damages induced by the Niigata Chuestu Earthquake in 2004 Reviewed

    HONGO Misao, URABE Atsushi, KATAOKA Kyoko, SUZUKI Koji, TAKAHAMA Nobuyuki

    Earth Scien   59 ( 1 )   3 - 4   2004.12

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    DOI: 10.15080/agcjchikyukagaku.59.1_3

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  • Lake-level changes during the past 100,000 years at Lake Baikal, southern Siberia Reviewed

    A Urabe, M Tateishi, Y Inouchi, H Matsuoka, T Inoue, A Dmytriev, OM Khlystov

    QUATERNARY RESEARCH   62 ( 2 )   214 - 222   2004.9

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    Lake-level changes inferred from seismic surveying and core sampling of the floor of Lake Baikal near the Selenga River delta can be used to constrain regional climatic history and appear to be correlated to global climate changes represented by marine oxygen isotope stages (MIS). The reflection pattern and correlation to the isotope stages indicate that the topset and progradational foreset sediments of the deltas formed during periods of stable lake levels and warm climatic conditions. During warm stages, the lake level was high, and during cold stages it was low. The drop in the lake level due to cooling from MIS 5 through MIS 4 is estimated to be 33-38 m; from MIS 3 through MIS 2, it fell an additional 11-15 m. Because the lake level is chiefly controlled by evaporation and river input, we infer that more water was supplied to Lake Baikal during warm stages. (C) 2004 University of Washington. All rights reserved.

    DOI: 10.1016/j.yqres.2004.06.002

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  • Holocene paleoenvironmental changes inferred from the diatom records of the Echigo Plain, central Japan Reviewed

    H Yabe, S Yasui, A Urabe, N Takahama

    QUATERNARY INTERNATIONAL   115   117 - 130   2004

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    The Echigo Plain (=Niigata Plain) located along the Japan Sea (East Sea) is one of the largest coastal plains in the Japanese Islands. The post-Wurm glacial sediments are well developed, reaching a thickness over 140 in in the central part of the Echigo Plain. Diatom floral changes of the Holocene borehole cores from the Tsukigata and Shirone areas of the Echigo Plain in Niigata were examined to infer the paleoenvironmental changes in this part of East Asia. Over 290 diatom taxa were identified in the Tsukigata TG-1 and Shirone S9-4 borehole cores, and were divided into nine and 13 provisional diatom units, respectively. Most of the horizons analyzed were characterized by fresh water species, and their environments were inferred as marshes, bogs and small ponds. The major brackish water horizon dated as 10,000-6800yr BP in the Shirone borehole core was correlated with the Jomon Transgression, which was the Holocene maximum transgression in the Japanese Islands. Several minor sea-level changes in the Echigo Plain were also recognized for the past 6800yr, which were caused not only by global eustatic changes, but also by the relative subsidence of the basin on account of its location in a tectonically active zone. (C) 2003 Elsevier Ltd and INQUA. All rights reserved.

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  • Identification and characterization of a subsided barrier island in the Holocene alluvial plain, Niigata, central Japan Reviewed

    A Urabe, N Takahama, H Yabe

    QUATERNARY INTERNATIONAL   115   93 - 104   2004

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    The Echigo Plain in the Niigata area of central Japan is a coastal alluvial plain facing the Sea of Japan. The Plain contains several rows of coastal sand dunes. During the Holocene maximum transgression, a barrier island sand body was formed on the plain. However, the distribution of this barrier island is partially intermittent. Based on facies analysis of cores, the barrier island succession was found to be buried by alluvium in the central part of the Echigo Plain. The barrier sand bodies do occur in the central part of the Echigo Plain, but they are deeply subsided and tilted by an active fault in the western margin of the plain. The alluvium in this area records a history of subsidence and changes in the depositional system due to the movements on the active fault. (C) 2003 Elsevier Ltd and INQUA. All rights reserved.

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  • A18 Supra- and pro-ignimbrite volcaniclastic resedimentation after the Numazawako eruption, Numazawa volcano, northeast Japan

    Kataoka Kyoko, Urabe Atsushi

    PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2004   18 - 18   2004

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    DOI: 10.18940/vsj.2004.0_18

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  • P-52 Gravity survey in the western margin of the Echigo Plain, Niigata, central Japan : Basement structure

    NAITO Nobuaki, URABE Atsushi, TAKAHAMA Nobuyuki, MAKINO Masahiko, SUMITA Tatsuya, WATANABE Shiro

    Annual Meeting of the Geological Society of Japan   2004   185 - 185   2004

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    DOI: 10.14863/geosocabst.2004.abst.0_185_2

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  • O-32 Development process of the barrier system in the subsided region of the Echigo Plain

    Urabe Atsushi, Yoshida Mamiko, Takahama Nobuyuki, Yasui Satoshi

    Annual Meeting of the Geological Society of Japan   2004   41 - 41   2004

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    DOI: 10.14863/geosocabst.2004.abst.0_41_2

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  • Formative ages of fluvial terraces and their upheaval movements in the northwest part of the Tokamachi basin in central Japan Reviewed

    WATANABE Hideo!URABE Atsushi

    Earth Scien   57   173 - 191   2003.12

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    DOI: 10.15080/agcjchikyukagaku.57.4_173

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  • Post-eruptive sedimentary and geomorphic responses to the 5 ka Numazawa eruption : volcaniclastic resedimentation along the Tadami and Agano River, northeast Japan

    URABE Atsushi, KATAOKA Kyoko

    Annual Meeting of the Geological Society of Japan   2003   152 - 152   2003

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    DOI: 10.14863/geosocabst.2003.0_152_1

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  • Temporal changes of proximal volcaniclastic resedimentation in the aftermath of the 5 ka Numazawa eruption, northeast Japan

    KATAOKA Kyoko, URABE Atsushi

    Annual Meeting of the Geological Society of Japan   2003   151 - 151   2003

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    DOI: 10.14863/geosocabst.2003.0_151_2

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  • Formation and Environmental Changes of a Holocene Brackish Lake in the Northern Echigo Plain, Central Japan Reviewed

    YASUI Satoshi, KAMOI Yukihiko, KOBAYASHI Iwao, URABE Atsushi, WATANABE Hideo, MIKATA Isao

    Quaternary Research   Mar-41 ( 3 )   185 - 197   2002.12

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    The upper Pleistocene and Holocene deposits in the northern Echigo Plain of central Japan are divided into lower, middle, and upper parts based on core data. The lower part was deposited from 40, 000 to 18, 000 yrs BP and consists of sand and gravel-supported conglomerate with alternating beds of sand and silt. The middle part (sedimentary unit I) was deposited from 10, 000 to 8, 000yrs BP and consists of sand and matrix-supported gravels. Facies analysis shows that the lower and middle parts comprise deposits of alluvial fan during the lowstand of sea level. The upper part (sedimentary units II and III) consists mostly of mud and sand that formed upward-coarsening sequences of lagoon-delta deposits. Detailed diatom analysis indicates that the history of the lagoon is divided into four stages. During the first stage (from 8, 000 to 5, 000yrs BP), a brackish lake environment with low salinity pervaded, due to flooding caused by a rapid rise in sea level of the Jomon transgression and the development of a sand dune. At the second stage (ca. 5, 000 yrs BP), the lagoon changed into a freshwater lake. During the third stage (from 5, 000 to 1, 000yrs BP), the lake accumulated a large amount of sandy sediments from the north to the south, and an eolian environment appeared. During the fourth stage (since 1, 000yrs BP), a freshwater area formed again, and has remained as the Shiotsugata Lagoon.

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  • Chronology and Developmental Process of Late Quaternary Fluvial Terraces in the Tsunan Area of the Shinano River, Central Japan Reviewed

    Quaternary Research   Mar-41   199 - 212   2002.12

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  • Tephrochronology of Late Pleistocene to Holocene Strath Terraces along the Aburuma River of the Niigata Basin, central Japan Reviewed

    Choi,J.T, Takahama,N, Urabe,A

    The Quaternary Research   41, No.1 ( 1 )   45 - 51   2002.12

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    This study clarified the tephrochronology of late Pleistocene to Holocene strath terraces younger than approximately 50ka, based on their geomorphologic configuration between marker tephra and terraces, that are distributed between the Kakinoki and Suhara districts of the Aburuma River, central east margin of the Niigata Basin, central Japan. Six levels of strath terraces (Ab-I, Ab-II, Ab-III, Ab-IV, Ab-V and Ab-VI) have developed and four tephra ashes (Ab-t4, Ab-t3, Ab-t2 and Ab-t1) have fallen since approximately 50ka. Ab-t2 can be correlated with the widespread tephra As-K (Asama-Kusatsu, 13ka), Ab-t3 with AT (Aira-Tanzawa, 25ka) and Ab-t4 with DKP (Daisen Kurayoshi, 50ka). Ab-t1 is thought to have fallen after 13ka. Only the Ab-II Terrace distributed locally in the upper reaches was formed by the primary movement of the Higashinomyo landslide approximately 50ka.

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  • Paleomagnetic dates of hominid remains from Yuanmou, China, and other Asian sites Reviewed

    M Hyodo, H Nakaya, A Urabe, H Saegusa, Xue, SR, JY Yin, XP Ji

    JOURNAL OF HUMAN EVOLUTION   43 ( 1 )   27 - 41   2002.7

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    Two hominid upper central incisors found in the Yuanmou Basin in southwest China in 1965 have affinities with Homo erectus fossils from Zhoukoudian, but exhibit primitive features. The Yuanmou hominid remains are alleged to be coeval with or older than African specimens dated at about 1-8 m.y.a. Recent age refinements of geomagnetic short reversal events and excursions permit assigning the Yuanmou hominid-bearing bed to the early Brunhes chron (about 0.7 m.y.a.). Magnetochronological assessments confirm that the Lantian calotte which has been dated to about 1.2 m.y.a., is the oldest reliable evidence for the emergence of Homo in eastern Asia as well as China, and that hominid fossils from Sangiran and Mojokerto, Java, do not exceed 1.1 Ma in age. These results refute the view that the genus Homo migrated into eastern Asia in the late Pliocene or the earliest Pleistocene. (C) 2002 Elsevier Science Ltd. All rights reserved.

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  • O-89 Geological and geographical history of the Paleo-Shiunji Lake, in the northern part of Echigo Plain, central Japan

    SATO Mitsuru, TAKAHAMA Nobuyuki, URABE Atsushi

    Annual Meeting of the Geological Society of Japan   2002   43 - 43   2002

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  • O-92 Seismo-tectonic subsidence in the Niigata Plain, central Japan

    TAKAHAMA Nobuyuki, URABE Atsushi

    Annual Meeting of the Geological Society of Japan   2002   45 - 45   2002

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  • O-88 Two depositional systems recognized in the alluvium of the Echigo Plain, Niigata Japan

    URABE Atsushi, TAKAHAMA Nobuyuki, YABE Hideo

    Annual Meeting of the Geological Society of Japan   2002   43 - 43   2002

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  • O-87 Upper Holocene palaeoenvironmental change inferred from diatom assemblages from central part of the Echigo Plain

    Yabe H., Yasui S., Maruyama S., Urabe A., Takahama N.

    Annual Meeting of the Geological Society of Japan   2002   42 - 42   2002

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    DOI: 10.14863/geosocabst.2002.0_42_2

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  • Lithostratigraphy and depositional history of the Late Cenozoic hominid-bearing successions in the Yuanmou Basin, southwest China Reviewed

    Atsushi Urabe, Hideo Nakaya, Tetsuji Muto, Shigehiro Katoh, Masayuki Hyodo, Xue Shunrong

    Quaternary Science Reviews   20 ( 15 )   1671 - 1681   2001

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    Late Cenozoic strata bearing hominids and hominoids are distributed in the Yuanmou Basin, Yunnan, southwest China. Incisors of Homo erectus discovered in these strata in 1965 reportedly show primitive features known in Africa Hu, Acta geologica sinica 1 (1973, p. 65). However, recent paleomagnetic study has revealed that the age of the hominid correlates to the early Brunhes chron (Hyodo et al., Journal of human evolution (2001), submitted). The lithostratigraphy of the successions that yield many mammalian fossils including those of the hominid, and the record of Equus is re-examined. The successions are divided in ascending order into the Longchuan, Shagou, Gantang (newly proposed Yangliuchun and Daipojing Members) and Yuanmou (newly proposed Dainawu and Niujianbao Members) Formations, based on different lithology and sedimentary facies. The newly proposed depositional systems of the formations are in ascending order, alluvial fan, ephemeral braided river, sandy braided river, ephemeral gravelly braided river and alluvial fan systems. The change in facies and paleocurrents revealed in the successions suggest that the basin was initiated as a syncline basin at ca 3.5 Ma and was completed as an asymmetric half graben by active movement of the eastern marginal fault in the early Middle Pleistocene. © 2001 Elsevier Science Ltd. All rights reserved.

    DOI: 10.1016/S0277-3791(01)00023-3

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  • O-245 Holocene diatom flora of Tsukigata area, Niigata Plain, Japan

    YABE Hideo, URABE Atsushi, TAKAHAMA Nobuyuki

    Annual Meeting of the Geological Society of Japan   2001   122 - 122   2001

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    DOI: 10.14863/geosocabst.2001.0_122_2

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  • O-376 Aggradation of the subsided Holocene barrier island - lagoon systems in the Echigo Plain, Niigata, Japan

    URABE Atsushi, TAKAHAMA Nobuyuki

    Annual Meeting of the Geological Society of Japan   2001   188 - 188   2001

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    DOI: 10.14863/geosocabst.2001.0_188_1

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  • Tephrochronology of late Quaternary strath terraces and their implications to neotectonic movements of the Shitada and Tochio regions of the Niigata Basin, central Japan. Reviewed

    Tad James Choi, Takahama N, Urabe A

    The Quaternary research   39 ( 6 )   521 - 533   2000.12

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    DOI: 10.4116/jaqua.39.521

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  • 鮮新ー更新統に認められる相対的海水準変動とその対比ー大阪・掛川・魚沼・上総層群を例としてー Reviewed

    ト部厚志

    地球科学   53   247 - 257   1999.12

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    DOI: 10.15080/agcjchikyukagaku.53.4_247

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  • 平野地下19mに埋没した5000年前の遺跡と火山灰層の発見 Reviewed

    ト部厚志, 高浜信行, 寺崎裕助

    新潟応用地質研究会誌   52   33 - 38   1999.12

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  • 新潟県における歴史地震の液状化跡-その1- Reviewed

    高濱信行, ト部厚志, 寺崎裕助, 大塚富男, Budi Brahmantyo, 江口友子, 中山俊道, 荒木繁雄, 川上貞雄, 田村浩司

    新潟大災害研年報   20   81 - 104   1999.12

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  • 新潟県津南町地域の貝坂段丘堆積物中の広域火山灰 Reviewed

    渡辺秀男, ト部厚志, 荒川勝利

    地球科学   53   420 - 433   1999.12

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    DOI: 10.15080/agcjchikyukagaku.53.6_420

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  • Middle to upper Pleistocene formations around Lake Kamo, Sado Island, Japan Reviewed

    Collaborative Research Group of the Kuninaka Formation

    Earth Science (Chikyu Kagaku)   53 ( 5 )   340 - 358   1999.12

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    The middle to upper Pleistocene formations distributed around Lake Kamo, Sado Island, are divided into the Ryotsu First, Ryotsu Second. Ryotsu Third, and Ryotsu Forth Terrace Deposits, and Ryotsu Younger Fan Deposit in ascending order. The Ryotsu Third Terrace Deposit called the Katabata Formation, intercalates the Katabata volcanic ash and the drifted pumices which are correlated with Kitsugi pumice fall deposit (K3) and Sambe-Kitsugi tephra (SK), respectively. The Ryotsu Forth Terrace Deposit is called the Agata Formation, and contains the Agata volcanic ash which may be correlated with the On-Pm1 or Pm-1A tephra. Brown-colored eolian soil deposits cover the terrace deposits, and are divided into the A to D Members in ascending order. Volcanic ash layers in these members are correlated with the marker tephras as follows: Akasaka B1 ash to On-Kt, Akasaka B2 ash to Aso-4, Akasaka B3 ash to DKP, Akasaka C ash to AT, Akasaka D ash to As-K. On the basis of relationship between the terrace deposits and these marker tephras, the Katabata and Agata Formations are correlated with the Shimosueyoshi and Obaradai Formations in the Kanto Plains, respectively. Depositional sequence of upper part of the Katabata Formation shows a typical upward-coarsening succession, and was formed by progradation of fan delta system. The altitude of foreshore sediments tend to become lower northward. This suggests that they are deposited at the regressive stage. The lower sequence of the Agata Formation shows a typical upward-finning succession. The upper sequence of the Agata Formation shows upward-coarsening succession in the northern part, while the sequence in the southern part includes nearshore and coastal plain facies, lacking foreshore facies. Depositional facies change of the Agata Formation shows a transgressive-regressive cycle. The formation was in barrier-island and estuary or lagoon systems in the transgressive stage, and in coastal plain systems in the following regressive stage.

    DOI: 10.15080/agcjchikyukagaku.53.5_340

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  • Neotectonics of Ojiya-Kawaguchi area, Niigata prefecture

    Imai Hidehiro, Kamijo Hitoshi, Takahama Nobuyuki, Urabe Atsushi

    Annual Meeting of the Geological Society of Japan   1999   112 - 112   1999

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    DOI: 10.14863/geosocabst.1999.0_112_1

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  • Guide book for excursion of Boso Peninsula Reviewed

    Suzuki Y, Mitsunashi T, Kodama K, Shinada Y, Yamauchi S, Urabe A

    International symposium on new concepts in global tectonics   0 - 56   1998.12

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  • 新潟県内の活断層と液状化跡 Reviewed

    ト部厚志, 高濱信行

    新潟の災害と防災   65 - 73   1998.12

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  • Progradation and regressive surface of erosion — example in Upper Pleistocene Katabata Formation —

    Tateishi M., Hatakeyama K., Kanzo K., Urabe A., Tanaka S.

    Annual Meeting of the Geological Society of Japan   1998   P038   1998

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    DOI: 10.14863/geosocabst.1998.0_P038

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  • 中国西南部雲南省元謀盆地の後期新生代の層序と堆積環境 Reviewed

    ト部厚志

    Northern HemisphereGeo-Bio Traverse   4   45 - 60   1997.12

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  • Stratigraphy and depositional sequences of the Pleistocene Toyofusa Group, southernmost part of the Boso Peninsula, central Japan(<Special Issue>Stratigraphy and Sedimentation of the Ouaternary System in Boso Peninsula, Japan) Reviewed

    Urabe Atsushi

    Earth Science (Chikyu Kagaku)   51 ( 2 )   83 - 103   1997.12

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    A forearc basin fill of the Pleistocene Toyofusa Group in the southern part of the Boso peninsula, Japan is represented by slope to shelf sediments. The Toyofusa Group is subdivided into the Kanamaribata Formation, Ohi Formation, Higashinagata Formation, Takigawa Conglomerate, Sagashi Formation and Ikenouchi Formation in ascending order, and correlated with the middle and upper parts of the Kazusa Group. The slope to shelf sediments form a northeasterly onlapping clastic wedge and include many numbers of volcanic ash layers. Mapping of depositional associations with tracing volcanic ash time marker, together with the interpretation of depositional facies, permits identification of stratal terminations and of temporal-spatial variations of depositional environments. These enabled a precise sequence-stratigraphic analysis of the sediments of the Toyofusa Group. Seven depositional sequences have been identified in the Toyofusa Group. Each the depositional sequences show lateral terminations of depositional facies and vertical facies discontinuities at the sequence boundaries. These depositional sequences consist of complete or incomplete assemblages of fundamental components of lowstand, transgressive, and highstand systems tracts. Fission track and paleo-magnetic ages for the Toyofusa Group showed that the depositional sequences can be correlated with oxygen isotope stages of 15 to 23. By the correlations, periodic formation of depositional sequences can be attributed to glacio-eustatic sea-level changes of about 40,000 to 100,000 years.

    DOI: 10.15080/agcjchikyukagaku.51.2_83

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  • Damage Caused by the 1995 Hyogoken-Nanbu Earthquake and Concealed Faults in the Hanshin Area, Hyogo Pref., Japan

    ENDO Hidenori, WATANABE Shiro, MAKINO Masahiko, MURATA Yasuaki, WATANABE Kazuaki, URABE Atsushi

    The Quat. Res.   35 ( 3 )   165 - 178   1996.7

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    The severest damage caused by 1995 Hyogoken-Nanbu Earthquake occurred within a narrow zone in the coastal plain between the Rokko mountains and Osaka Bay, from Kobe City to Nishinomiya City. The distribution map of the damage rate of houses indicates that the boundaries in which the damage rates change sharply lie on a straight line or segment.<br>Seismic and gravity measurements were conducted to reveal the subsurface geological structure of this coastal plain. Seismic reflection surveys were carried out along two survey lines across the zone. The gravity measurements were made at 1, 824 points, most of which have a short interval of about 25m along observation lines. The following conclusions were derived from this study.<br>(1) The seismic profiles show concealed faults below the shallow subsurface deposits in the coastal plain.<br>(2) Remarkably steep gradients of Bouguer anomalies are distributed along the boundary of the Rokko mountains and the plain.<br>(3) Estimation of the gravity structure shows that the basement dips steeply toward Osaka Bay, and that the largest step with concealed faults exists in the coastal plain.<br>The distribution of the damage rate of houses is consistent with the location of the concealed faults. In particular, the northern boundary of the severely damaged zone is situated nearly on the largest step of the basement structure. Therefore, it is concluded that the subsurface geology with concealed faults caused the seismic disaster in the coastal plain.

    DOI: 10.4116/jaqua.35.165

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  • 202. Transgressive depositional systems and relative sea level changes of the Plio-Pleistocene Uonuma Group, Niigata, central Japan

    Urabe Atsushi, Tateishi Masaaki, Kazaoka Osamu

    Annual Meeting of the Geological Society of Japan   1995   185 - 185   1995

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    DOI: 10.14863/geosocabst.1995.0_185_1

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  • Ash fall deposits included in brown soil of the Sado Island, Niigata Prefecture, Japan

    Watanabe Hideo, Arakawa Katsutoshi, Terasaki Kouiti, Kanzou Katsuaki, Urabe Atsushi, Tateishi Masaaki

    Earth Science (Chikyu Kagaku)   48 ( 1 )   51 - 56   1994

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    DOI: 10.15080/agcjchikyukagaku.48.1_51

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  • 201. High-frequency depositional sequences of the Toyofusa Group in the southern part of the Boso Peninsula,Japan

    URABE Atsushi

    Annual Meeting of the Geological Society of Japan   1994   148 - 148   1994

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    DOI: 10.14863/geosocabst.1994.0_148_2

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Books

  • 地域地質研究報告 5万分の1地質図幅 新潟及び内野

    鴨井幸彦, 安井 賢, 卜部厚志( Role: Joint author)

    産業技術総合研究所  2016.6 

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    Total pages:180   Language:Japanese Book type:Report

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  • 古代の災害復興と考古学

    卜部厚志( Role: Edit)

    高志書院  2013 

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  • 地震災害への備えを考える

    卜部厚志( Role: Contributor)

    新潟日報事業社  2009 

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  • 安全・安心の環境づくり

    小宮信夫ほか( Role: Joint author ,  322-333)

    ぎょうせい  2008.9 

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  • Niigata Chuetsu Earthquake 2004

    Takahama Nobuyuki, Urabe Atsushi( Role: Joint author)

    2006.12  ( ISBN:4861321905

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  • 味方村史通史編 味方排水機場遺跡調査報告書

    高浜信行, ト部厚志, 寺崎裕助( Role: Sole author ,  10)

    味方村  2000.12 

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  • 横須賀地域の地質

    江藤哲人, 矢崎清貫, ト部厚志, 磯部一洋( Role: Sole author ,  20)

    地質調査所  1998.12 

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MISC

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Research Projects

  • 瀬戸内海沿岸域における津波堆積物の発見による南海トラフ巨大地震への対策

    Grant number:22H01743

    2022.4 - 2026.3

    System name:科学研究費助成事業

    Research category:基盤研究(B)

    Awarding organization:日本学術振興会

    寺林 優, 卜部 厚志, 酒井 英男, 金田 義行

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    Grant amount:\17290000 ( Direct Cost: \13300000 、 Indirect Cost:\3990000 )

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  • 堆積物の放射能・磁性・物性による豪雨・地震・火山活動に伴う土砂災害史復元法の開発

    Grant number:22H01738

    2022.4 - 2025.3

    System name:科学研究費助成事業

    Research category:基盤研究(B)

    Awarding organization:日本学術振興会

    落合 伸也, 柏谷 健二, 酒井 英男, 福士 圭介, 卜部 厚志, 石丸 聡

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    Grant amount:\17030000 ( Direct Cost: \13100000 、 Indirect Cost:\3930000 )

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  • Identification of earthquake-triggered turbidites in lacustrine sedimentary sequences using anisotropy of magnetic susceptibility and micro-XRF analyses

    Grant number:21K18395

    2021.7 - 2024.3

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Challenging Research (Exploratory)

    Awarding organization:Japan Society for the Promotion of Science

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    Grant amount:\6370000 ( Direct Cost: \4900000 、 Indirect Cost:\1470000 )

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  • 越後縄文人の食性変化と多雪化の関係を明らかにする研究

    Grant number:20H01344

    2020.4 - 2024.3

    System name:科学研究費助成事業

    Research category:基盤研究(B)

    Awarding organization:日本学術振興会

    吉田 邦夫, 能城 修一, 卜部 厚志, 植月 学, 阿部 昭典, 宮尾 亨

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    Grant amount:\17810000 ( Direct Cost: \13700000 、 Indirect Cost:\4110000 )

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  • Regional study of paleoenvironment and subsistence at Kitamachi wetland site in the Incipient Jomon culture

    Grant number:20H01353

    2020.4 - 2023.3

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Scientific Research (B)

    Awarding organization:Japan Society for the Promotion of Science

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    Grant amount:\17680000 ( Direct Cost: \13600000 、 Indirect Cost:\4080000 )

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  • 令和元年台風19号及び台風21号による広域災害に関する総合研究

    Grant number:19K24678

    2019.12 - 2023.3

    System name:科学研究費助成事業

    Research category:特別研究促進費

    Awarding organization:日本学術振興会

    二瓶 泰雄, 中北 英一, 竹見 哲也, 山田 朋人, 三隅 良平, 飯塚 聡, 鈴木 真一, 仲江川 敏之, 柳瀬 亘, 立川 康人, 田中 茂信, 佐山 敬洋, 田中 智大, 朝位 孝二, 前野 詩朗, 田中 仁, 吉谷 純一, 田中 規夫, 泉 典洋, 矢野 真一郎, 森脇 亮, 赤松 良久, 内田 龍彦, 重枝 未玲, 岩崎 理樹, 清水 義彦, 小山 毅, 長谷川 兼一, 西嶋 一欽, 藤本 郷史, 毛利 栄征, 前田 健一, 岡村 未対, 卜部 厚志, 森口 周二, 蝦名 裕一, 松四 雄騎, 王 功輝, 竹林 洋史, 鈴木 素之, 田島 芳満, 佐々木 淳, 信岡 尚道, 森 信人, 有川 太郎, 鈴木 崇之, 下園 武範, 松井 正宏, 小林 文明, 畑山 満則, 牛山 素行, 佐藤 健, 梶谷 義雄

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    Grant amount:\38090000 ( Direct Cost: \29300000 、 Indirect Cost:\8790000 )

    令和元年東日本台風(台風19号)とその2週間後の大雨(台風21号と低気圧)による広域災害の被害状況・メカニズムの全容を明らかにすることを目的とし,多角的・総合的に多くの分野の専門家からなる研究グループを結成し,調査研究を継続して行った.ここでは,①台風・低気圧による豪雨・流出現象の気象学的解明,②広域にわたる洪水氾濫災害を引き起こしたメカニズムの解明,③多発した土砂災害・土構造物破壊におけるメカニズムの解明,④強風や高潮による被害実態の解明,⑤住民の避難行動の実態と防災情報の伝達状況の把握,の5つのテーマと主に対象とした.その結果,台風19号による豪雨に,山岳部は勿論,平野部でもseeder-feeder機構が貢献していることを,XRAINによる立体観測情報,ひまわりによる観測情報により,seeder-feeder機構を表現した数値モデルを用いて示した.2019年台風19号による豪雨発生機構について,気象庁メソ客観解析データを用いて,降水活動に係る大気安定度や水蒸気場の解析をし,本豪雨発生時には,最近の他の豪雨事例と比較して,湿潤絶対不安定が持続して形成されていたことが分かった.また,洪水氾濫による建築被害に関しては,長野市内の水害被害住宅を対象に,復旧後の室内環境に着目して現地調査を実施している.復旧には数ヶ月の期間を要するが,復旧手順は現地の判断で実施している場合が多く,客観的な情報が整備されていない.その一助となるべく,限られた事例ではあるが,復旧手順とともにそれに伴う環境改善効果を評価しながら知見を蓄積し,環境改善を測るために室内の浮遊真菌濃度や部位の含水率等を計測した.さらに,風水害に関しては,台風に伴って発生した竜巻の影響が大きかったため,台風と竜巻発生の関係を過去の気象資料から抽出し整理した.

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  • The reconstruction of formational process of coastal plains and sea level change of Toyama Bay area

    Grant number:19K03987

    2019.4 - 2022.3

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Scientific Research (C)

    Awarding organization:Japan Society for the Promotion of Science

    URABE ATSUSHI

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    Grant amount:\4290000 ( Direct Cost: \3300000 、 Indirect Cost:\990000 )

    Several borehole investigations were carried out in the Imizu Plain along the Toyama Bay coast to reconstruct the sedimentary facies of the Alluvium, the evolution of the sedimentary environment and paleogeography of the area. The results indicate that a narrow sandbar and a muddy lagoon were established near the present shoreline about 7200 years ago, and that the peak elevation of the Jomon sea level in this area was similar to that of the present sea level. The results of the borehole survey in the Uozu buried forest area, combined with the previous borehole results, indicate that the formation of the buried forest in the Uozu area was not caused by climatic change in sea level, but by relative sea-level change (subsidence).

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  • Did large-sized earthquake-induced tsunamis repeatedly strike the Pacific coast of western Hokkaido?

    Grant number:19K03986

    2019.4 - 2022.3

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Scientific Research (C)

    Awarding organization:Japan Society for the Promotion of Science

    Takashimizu Yasuhiro

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    Grant amount:\4420000 ( Direct Cost: \3400000 、 Indirect Cost:\1020000 )

    In this study, the survey of tsunami deposit were conducted along the western Pacific coast of Hokkaido from FY2021 to FY1991. Whether large-sized tsunamis with an average recurrence interval of 400 years, such as recognized in the eastern part of Hokkaido, can be observed in the western Pacific coast of Hokkaido were examined. In particular, the tsunami reccurence for the past 3,000 years in the Yufutsu area of Tomakomai City and the Shiomi area of Mukawa Town was examined, where the 17th century tsunami deposits were distributed. However no tsunami traces were found in any of the sites. Therefore, it is considered that there were no large-sized tsunami events with an interval of several hundred years at least in the past 3000 years.

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  • Comprehensive study on the 2018 Hokkaido Eastern Iburi Earthquake and its disaster

    Grant number:18K19952

    2018.10 - 2019.3

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Special Purposes

    Awarding organization:Japan Society for the Promotion of Science

    Takahashi Hiroaki

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    Grant amount:\41470000 ( Direct Cost: \31900000 、 Indirect Cost:\9570000 )

    Comprehensive investigation on the 2018 Hokkaido Eastern Iburi earthquake and its disaster was conducted. Mainshock rupture initiated at deepest part and major slip was occurred in 20-30km deep. Multiple simultaneous landslides in Atsuma town was induced by combination of strong ground shaking and weak sliding layer between pyroclastic fall deposit layers. Halloysite cray minerals was discovered in all sliding layers. Simulation suggested landslides might attack residential houses within 6 seconds. Observed peak ground motions in nearby area were larger than common distance attenuation model. Severe wooden house damage in Mukawa town was due to amplified seismic waves due to site effects. Sounding and boring investigation revealed filled low-density volcanic ash and higher groundwater level in liquefaction area. Electricity blackout caused severe damage in social and economic activities of Hokkaido. These scientific outcomes were explained to residents at public briefing session.

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  • Unraveling small-scale eruptions and lahar events by high-resolution stratigraphy of distally deposited volcaniclastic deposits: Re-assessment of eruption frequency and hazard risk areas

    Grant number:18H01291

    2018.4 - 2022.3

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Scientific Research (B)

    Awarding organization:Japan Society for the Promotion of Science

    Kataoka Kyoko

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    Grant amount:\17030000 ( Direct Cost: \13100000 、 Indirect Cost:\3930000 )

    Small-scale eruptions emplace small volume of primary tephra on steep slopes of volcanoes. These proximal tephra deposits are easily degraded due to rainfall, snowmelt, and wind soon after their deposition. Hence, the preservation potential in the geological record is low. This study aims to elucidate the history of small-scale eruptions and related lahars and to evaluate the frequency of eruptions. We analyzed the core samples obtained from the Sukawa Basin, Inawashiro Plain, and Lake Inawashiro in a lower catchment of Adatara and Bandai volcanoes. We recognized a number of lahar deposits and their runout subaqueous deposits, originated from Adatara and Bandai, intercalated in both fluvial and lacustrine sedimentary cores. The radiocarbon dating of these event deposits indicates the presence of unknown and more frequent eruption and lahar events than previously thought, and therefore, it is necessary to reassess the eruptive history and activity at these volcanoes.

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  • Identification of the chronological and spatial changes of the radiocarbon marine reservoir effect around Japan

    Grant number:18H01310

    2018.4 - 2021.3

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Scientific Research (B)

    Awarding organization:Japan Society for the Promotion of Science

    Nakanishi Toshimichi

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    Grant amount:\17550000 ( Direct Cost: \13500000 、 Indirect Cost:\4050000 )

    The radiocarbon ages derived from the marine surface water before the nuclear tests are 200 to 1000 years older than the values of atmospheric origin around Japan. On the other hand, the radiocarbon ages of marine carbonate fossils are as old as than terrestrial plant samples of atmospheric origin from the same horizons of Holocene sediments in Kyushu to the Korean coast. These marine reservoir effects are crucial problem in academic fields such as earth science, physical geography, archeology, and history because they obstruct the calibration of radiocarbon ages of marine samples to the calendar years. In order to solve the problem, the spatio-temporal changes in the marine reservoir effect were investigated the latest Pleistoce to Holocene coastal sediments in the region from eastern Hokkaido to southwestern Taiwan.

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  • New models for identification of paleo-tsunami deposits from Ria-type coast and marine terrace

    Grant number:16K05574

    2016.4 - 2019.3

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Scientific Research (C)

    Awarding organization:Japan Society for the Promotion of Science

    Takashimizu Yasuhiro, Kawakami Gentaro, Nishina Kenji, Hirakawa Kazuomi

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    Grant amount:\4680000 ( Direct Cost: \3600000 、 Indirect Cost:\1080000 )

    New models to identify paleo-tsunami deposits from the Ria-type coast and marine terrace were explored in this study. Detailed methods of sedimentary analysis were also examined.
    Ria coast: The sedimentary textural maturities of tsunami deposits from different origins varied significantly. These extreme differences, therefore, possessed a high potentiality in identifying the tsunami deposits. The grain roundness will be a good indicator for this purpose.
    Marine terrace: We found suddenly formed coarse-grained deposits under soil-accumulated environments. Based on analyses of sedimentary texture and age dating of the event deposits, including marine-derived materials, the present study only pointed out the possibility of tsunami deposits. However, we couldn't reach the exact identification of tsunami deposits so far. We will start further studies on this issue in the future.

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  • Detecting trace of paleo-tsunami event from the bed form on the seafloor of a coastal shelf

    Grant number:26350480

    2014.4 - 2017.3

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Scientific Research (C)

    Awarding organization:Japan Society for the Promotion of Science

    NISHINA Kenji, KASE Yoshihiro, HAYASHI Keiichi, SAGAYAMA Tsumoru, URABE Atsushi, TAKASHIMIZU Yasuhiro

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    Grant amount:\4160000 ( Direct Cost: \3200000 、 Indirect Cost:\960000 )

    Numerical simulations of tsunamis from various wave sources and at various paleo-sea level settings were conducted. Taking into account the recent sea level at Ishikari Bay, the calculated tsunami wave-current velocity is on par with the measured current velocity, which is influenced by internal waves during storm events. Due to the low potential for tsunami traces to be generated and preserved, detecting these on the continental shelf of Ishikari Bay is difficult.
    The results of the survey using numerical simulations of tsunami wave velocities in the south-eastern Japan Sea revealed the presence of a particular point on the shelf where a strong flow is generated by a wave with a specific source. The tsunami traces at that site may make it possible to constrain estimates of the source of the paleo tsunami wave.

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  • 地形・地質要因による地盤災害の軽減に関する研究

    2009.4 - 2011.3

    System name:地域復興支援事業

    Awarding organization:地方自治体

    卜部厚志

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    Authorship:Principal investigator  Grant type:Competitive

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  • 沖積平野の形成発達過程を制御する海水準変動以外の要因の抽出とその定量化

    2009.4 - 2011.3

    System name:科学研究費助成事業

    Research category:基盤研究(C)

    Awarding organization:日本学術振興会

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    Grant type:Competitive

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  • Development of the villages and the use of forest resouces during the Jomon Era. Archaeological, dendrochronological and folkloric analyses.

    Grant number:21320151

    2009 - 2012

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Scientific Research (B)

    Awarding organization:Japan Society for the Promotion of Science

    KIMURA Katsuhiko, DAIRAKU Kazumasa, YAMADA Masahisa

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    Grant amount:\17940000 ( Direct Cost: \13800000 、 Indirect Cost:\4140000 )

    Dendrochronological techniques of both tree-ring width and tree-ring oxygen isotopic analyses applied to the wooden posts of Aota Jomon Site revealed that there were two major village construction periods of ca. BC477 and BC530, the first success in Japan to precisely date anthropological events in Jomon Era. Pollen analysis of deposits in and around Aota Site showed chestnut trees, the most important wood and food resource plant in Jomon, were maintained nearby the village.

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  • An Interdisciplinary Inquiry into the Emergence of Jomon Culture-Paleo-environment and Exploitation-based on the Excavation of Peat Bog Layers at the Unoki Site in Niigata Prefecture, Japan

    Grant number:21320148

    2009 - 2011

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Scientific Research (B)

    Awarding organization:Japan Society for the Promotion of Science

    TANIGUCHI Yasuhiro, YOSHIDA Kunio, MOMOHARA Arata, URABE Atsushi, NOSHIRO Syuichi

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    Grant amount:\17810000 ( Direct Cost: \13700000 、 Indirect Cost:\4110000 )

    The purpose of this project is to evaluate the emergence of Jomon culture in correlation with the Pleistocene-Holocene transition in Japan. In order to achieve this aim, we excavated peat bogs at the Unoki site in Tsunan area of Niigata prefecture and investigated the nature of changes in the local environment and patterns of human behavior during the Jomon period from an interdisciplinary perspective. We detected a series of five peat layers with abundant botanical remains from the Incipient to the Final Jomon periods along with supporting chronometric, geological and archaeological data. Based on these evidences, we hypothesize the typical location of the Incipient Jomon sites(clustered around river lowlands), the function of early potteries, and the patterns of land exploitation adopted by Jomon people, assessing at the same time their correlation to the concurrent changes in the environment.

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  • 野地遺跡の立地環境に関する地質学的調査

    2005.12 - 2006.3

    System name:受託研究

    Awarding organization:(財)新潟県埋蔵文化財調査事業団

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    Grant type:Competitive

    Grant amount:\3300000

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  • 大規模なイベント性堆積作用による沖積層の堆積システムの変遷と平野の形成

    2005.4 - 2007.3

    System name:科学研究費助成事業

    Research category:基盤研究(C)

    Awarding organization:日本学術振興会

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    Grant type:Competitive

    Grant amount:\3500000 ( Direct Cost: \3500000 )

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  • Generation processes and releasing mechanism of slushflow

    Grant number:17510147

    2005 - 2007

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Scientific Research (C)

    Awarding organization:Japan Society for the Promotion of Science

    KAWASHIMA Katsuhisa, IZUMI Kaoru, URABE Atsushi

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    Grant amount:\3220000 ( Direct Cost: \3100000 、 Indirect Cost:\120000 )

    The Mizunashi river, located in the southern part of Niigata prefecture, is one of the rivers where slushflows often occur. The middle and lower reaches of the river flows in the alluvial fan and joins the Uono river In order to make clear hydrogeological and hydrometeorological backgrounds lurking behind the repeated occurrence of slushflow, hydrological observations, including water levels of the stream and groundwater levels, glaciological observations and subsurface structure investigations were carried out in this river The following are main results obtained.
    1. Disappearance of surface water and snow accumulation on river bed
    At the lower edge of the fan, the surface water often disappears entirely from the river channel. The position where surface water disappears depends on the discharge at the apex of fan. Since the apex discharge decreases to 2 m^3/s or less during the snow season, the snow accumulation on the river bed is possible between the confluence point and 5 km point to the upstream side. This fills one of the necessary conditions of slushflow occurrence.
    2. Subsurface structure and groundwater level
    Electric prospecting surveys and existing boring data permitted the estimation of subsurface structure along the river. The water table becomes the deepest at the 45 km point in concert with the drastic drop of basement It appears certain that this structure contributes to the disappearance of surface water mentioned above.
    3. Fluctuations of river water level during the snow season and slushflow releases
    Measurements of river water level showed that water flowed continuously throughout the winter at the apex of fan. Meanwhile, surface water completely disappeared from the beginning of snow season to midwinter When large quantity of water was supplied to the river basin by the passage of low-pressure systems in winter, sudden emergence of surface water and rapid rise of water level were observed several times at the middle and lower reaches of the river where its bed was covered with snow. At those cases, after the entire snowpack had been saturated with water in several minutes, water was flowing over the snow surface over 5-10 m in width and the slushflow released in some cases.
    4. Conclusions and future issues
    Slushflows in the Mizunashi river are characterized by hydrological environments peculiar to alluvial fans, a extremely-low slope angle and a lack of impermeable bed surface, such as permafrost, ice and rock. Aiming at the development of the forecast method of slushflows in the Mizunashi river, it is necessary to develop the behavior model of surface water in which interaction relationships between groundwater and river water must be considered It is likely that the frequency of rainfall in midwinter is increasing in Japan due to effects of global warming; the clarification of slushflow may become important more and more.

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  • Evaluation of impacts by sea-level rise on the alluvial deltas

    Grant number:16204039

    2004 - 2007

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Scientific Research (A)

    Awarding organization:Japan Society for the Promotion of Science

    TATEISHI Masaaki, KURITA Hiroshi, URABE Atsushi, NAKAMOTO Nobutada, TANAKA Satoshi

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    Grant amount:\31850000 ( Direct Cost: \24500000 、 Indirect Cost:\7350000 )

    Sedimentological facies and biofacies have been analyzed and ages of 54 samples have been dated for alluvial sediments of 130 m core bored at Yoroigata, located in the western part of Niigata Plain On the basis of the results, burial process of the incised valley and sedimentary process of the Niigata plain by sea-level rise after the last glacial age have been reconstructed. Depression rate of the present area is about 3 mm/year during last 10,000 years.
    Changes of salt water intrusion as fluctuation of water discharge in low flow and high flow seasons, water quality of salt and fresh water; and sedimentological and chemical features of sediments in water masses and bottom sediments have been measured at the river mouth of Agano Rives Niigata. In the low flow season, salt water reached at 12 km from river mouth. Halocline by echo-sounding system revealed salt water wedge of weak-mixed type of salt/fresh water boundary. The important basic data has been get for movement and settle of fine-grained sediments.
    Prosperity and decline of longshore bars and sand beaches have been investigated geomorphologically and sedimentologically during dry and wet seasons at the Badon coast, Tra Vinh Province, Mekong River delta, south Vietnam. Geomorphology and sedimentary structure of surface of longshore bars and beaches have been changed as changes of direction and speed of longshore and wave currents during dry and wet seasons at the erosional and depositional coasts.
    The result of salt water intrusion measured along Co Chien Rivet one tributary of the Mekong River from 2000 to 2005 were summarized and published as papers.
    Occurrence mode of a lot of old woods appeared on the sea bottom surface off Izumozaki, Chuetsu district, Niigata, at the time of 2007 Chuetsu-Oki Earthquake has been investigated by scanning sonar. The analysis of 14C ages and species of woods were synthesized with occurrence mode on the sea bottom of the woods, and a formation and transportation processes of a lot of Jomon woods were discussed.
    The result of present study supplied the basic data for the detail consideration of formation. process of alluvial delta and plain

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  • 平成16年7月新潟・福島、福井豪雨災害に関する調査研究

    Grant number:16800001

    2004

    System name:科学研究費助成事業

    Research category:特別研究促進費

    Awarding organization:日本学術振興会

    高濱 信行, 卜部 厚志, 和泉 薫, 大熊 孝, 服部 勇, 林 春男

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    1 洪水と破堤に関する気象学・河川工学・地盤工学からの検討
    (1)記録的な豪雨に対して,アメダス気象観測点の他に多数の雨量観測を収集した.雨量の解析から日雨量400mmを越える降雨は新潟県の栃尾地域のみではなく西部の出雲崎地域にも分布していたことが明らかとなった.
    (2)流域の3つのダムは,降雨初期には貯水効果を発揮したが,記録的な降雨量のため機能を超過したため,中流域では堤防を各地で越流する超過洪水となっていたことが明らかとなった.
    (3)2つの大規模な破堤地点での要因は,最終的には越流が引き金になっている.しかし,三条地域では旧河川流路にあたる砂礫地盤の直上部が破堤しており,堤外の水圧の増加に伴って砂礫地盤への浸透がおこり堤防が不安定になり一気に決壊したものと考えられる.
    (4)破堤部付近で住家の破壊・流出を含めた建物被害の分布と広域的な浸水深度と流向の測定を行ない,浸水の深度分布と拡散過程を明らかにした.
    2「災害弱者」の防災対策の検討
    高齢者など災害弱者を中心とした被災状況を詳しく調査・分析した.この結果,高齢者の中でも独居や要介護者が被災したことが明らかとなった.また,在宅避難のあり方についても提言を行なった.
    3 地すべりなどの土砂災害に関する地質・地盤工学からの検討
    栃尾地域と出雲崎地域の斜面災害について,分布と要因を解析した.表層崩壊,岩盤崩壊,崩壊性地すべりなどいくつかのパターンに区分できた.
    4 洪水が農作物に与えた被害の実態調査と今後の評価
    冠水地での水稲の生育被害を調査した.結果は冠水日数によって分げつ数の違いがあり枝穂の増加によって収量の低下が認められた.また,被災直後の衛星画像解析から,被害(収量減少)の予測が可能であることが明らかとなった.

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  • 新潟平野における縄文海進以降の相対的海水準変動と堆積システムの変遷

    2003.4 - 2005.3

    System name:科学研究費助成事業

    Research category:基盤研究(C)

    Awarding organization:日本学術振興会

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    Grant type:Competitive

    Grant amount:\3700000 ( Direct Cost: \3700000 )

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  • Sedimentary organic matter analysis for the studies of sea-level and climatic changes in estuary and nearshore environments

    Grant number:13440146

    2001 - 2002

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Scientific Research (B)

    Awarding organization:Japan Society for the Promotion of Science

    HONAYAGI Koichi, YOSHIDA Kohki, MURAKOSHI Naomi, KUMON Fujio, URABE Atsushi, KURITA Hiroshi

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    Grant amount:\14500000 ( Direct Cost: \14500000 )

    We carried out grain-size, organic matter composition, and total organic carbon (TOC) analyses, using the cores of modern lake sediment from Lake Kizaki and Pleistocene marine shelf sediment of Inubou Group in 2001. As the results, surface lake sediments contain 50 to 60 percents of amorphous organic matter and they varied with climatic change. Shelf sediments also include much amorphous organic matter and the proportions of them were various with climatic change.
    In 2002, we drilled 50 m and took successive cores at two sites on the Niigata Plain for the study of facies and sequence analyses, insoluble particulate organic matter composition, and total organic carbon (TOC) and total surfer (TS) analyses in 2002. The Niigata Plain is situated in the central part of the main Japanese Island. Holocene sediment in the Niigata Plain is more than 140 m in thickness.
    Incised valley sediment is composed of transgressive (TST) and highstand (HST) systems tracts. The maximum flooding surface(MFS) is set up at the most fine-grained part of clayey silt. Age of the maximum flooding stage can be estimated to be 7,800 years B.P.
    TST is composed of the bayhead delta and estuarine lagoon sediments and their TOC contents are 0.5 to 1%. HST consists of lagoon and fluvial sediment. TOC contents increase upward in HST sediments. TS content of the HST lagoon sediment is higher than that of the TST lagoon sediment. HST lagoon was much stagnant than TST lagoon, because the estuary mouth was closed by the adjacent delta system.
    Lagoon and fluvial sediments have high contents of land-derived organic matter, such as sporinite, cutinite, vitrinite, and non-fluorescent amorphous organic matter(NFA). Marine organic matter, such as alginite, is rarely found, but it increases seaward. Degradation and preservation of organic matter are depended on sea floor condition. Since the compositional variation of organic matter is controlled by sedimentary environments and sea-level position, integration of facies, organic matter, TOC and TS analyses make it possible for precise sequence interpretation of incised valley fill sediments.

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  • The regional study on water transports at internal water revel and on the site in early Japan

    Grant number:12301017

    2000 - 2003

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Scientific Research (A)

    Awarding organization:Japan Society for the Promotion of Science

    KOBAYASHI Shoji, TAKAHAMA Nobuyuki, YATA Toshihumi, YOSHII Kenichi, HASHIMOTO Hirohumi, URABE Atsushi

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    Grant amount:\38500000 ( Direct Cost: \32200000 、 Indirect Cost:\6300000 )

    The purpose of this study has been to make the regional history evidence with the sites of internal water level and with the environment of historical images on ECHIGO-Plain. Specially, we should advance to discovering of NUTARI-palisade with a new understanding based on analysis of manuscripts, old maps and archeological remains, and with a boring survey & excavation.
    (1)The conjectured location of the NUTARI-palisade has been OSE that is based on Jokyo map of the Nuttari section of Niigata City, and we conducted a boring survey. We verified an accumulation of a flow of volcanic ash and a swamp from about 5000 years ago at a depth of about 18 meters beneath the railroad tracks and confirmed the need to fundamentally re-write the conclusion heretofore, derived from land surface observations, that formation of the new sand dune III presumed to have been formed in the Tomb Age, actually dates from before the middle Jomon era.
    (2)At a depth of about five meters we discovered an old stratum of topsoil above which were accumulated remains of vegetation with a carbon 14 data of about 1180 plus-or-minus 30 years. We employed a geoslicer commonly used in probing earthquakes to examine in stead of excavation. We were able to determine that this area was old wet rice paddy. And we have thought that there is remained in this soil of the sites of NUTARI-palisade and KANBARA-harbor.
    (3)As for geological features, we advanced general understanding of the action of sand barrier systems and delta creation that formed the Echigo Plain and also geotechtonic structures.
    We have advanced a new understanding the intimate link created by the internal water level between the NUTARI and IWAFUNE palings. For the medieval era, we have identified the autonomous management of the activity of the GEJYO-boats that plied both the Age and Shinano rivers, we have understood natural development of the regional characteristics of the area, and we have implemented supplementary investigations.
    (4)These research results were presented at an international/regional interdisciplinary symposium in an exchange with Professor of Korea, USA, UK, these scholars uniformly called for sharing of our studies with scholars throughout the world for the purpose of promoting regional and comparative study. And we held a public symposium directed at general audience.

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  • Evolutionary History of Mammalian Fauna and Paleoenvironments -Late Cenozoic Eurasia and North America-

    Grant number:06041079

    1994 - 1996

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for international Scientific Research

    Awarding organization:Japan Society for the Promotion of Science

    NAKAYA Hideo, XUE Shunrong, URABE Atsushi, KATO Shigehiro, SAEGUSA Haruo, TANAKA Satoshi, SATO Hiroshi, NAGAOKA Shinji, MUTO Tetsuji, KAWABE Takayuki, YAMANAKA Chihiro, HYODO Masayuki, NASU Takayoshi, OTOFUJI Yoichiro, ITAYA Tetsumaru, IKEYA Motoji, YIN Jiyun, JI Xueping, JIANG Nengren

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    Grant amount:\26600000 ( Direct Cost: \26600000 )

    The purpose of this research is to interpret the paleoenvironments and biostratigraphy of Late Cenozoic mammalian fauna and human evolution in the Eastern Eurasia.
    In 1993, the Japanese and Chinese joint expedition conducted stratigraphical, sedimentological, geochronological and paleontological survey in the Yuanmou Basin, Yunnan Province, Southwest China. The field work was done during the dry season (mainly December) from 1994 to 1996. Paleontologists and geologists surveyed hominid and hominoid sites of Yuanmou Basin in detail, and collected paleoenvironmental and geochronological samples from the late Cenozoic strata of Yuanmoun Basin. Furthermore, Paleontologists researched the late Cenozoic Eurasian mammalian fossils in the many museums of Europe, North America, Asia and East Africa.
    The following conclusions are reached :
    1.The age of Hominid fossils from the Yuanmou Formation in this basin was determined by he result of magnetostaratigraphy, correlation with mammalian faunas of North China and climatic change based on pollen analysis. It's age is younger than the age of hominids of the previous researches.
    2.The result of pollen analysis shows that the late Cenozoic paleoenvironment of the Yuanmou Basin was changed to cooler and dryer climate during the late Pliocene to early Pleistocene.
    3.The age of Hominoid fossil from the Northern part of Yuanmou Basin wad determined by correlation of other Eurasian mammalian faunas only. It's age is older than the age of the Gantang Formation and Yuanmou Formation in the southern part of this basin.
    We presented this results at the 1995 and 1996 annual meeting of the Society of Vertebrate Paleontology (Pittsburgh, New York), and 31st International Geological Congress in Beijing 1996.
    We plan to research the Late Genozoic environmental change, evolution and correlation of the mammalian fauna in the Siwaliks (India and Nepal) and Southeast Asia (Burma to Vietnam).

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Teaching Experience (researchmap)

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Teaching Experience

  • 原子力の未来と災害を考える

    2023
    Institution name:新潟大学

  • 突発災害特論

    2022
    Institution name:新潟大学

  • 論文講読演習

    2021
    Institution name:新潟大学

  • 卒業論文II

    2021
    Institution name:新潟大学

  • フィールド安全論

    2021
    Institution name:新潟大学

  • 地学基礎C

    2021
    Institution name:新潟大学

  • 環境地質学実習

    2021
    Institution name:新潟大学

  • 地質調査法実習II

    2021
    Institution name:新潟大学

  • 地質調査法II

    2021
    Institution name:新潟大学

  • 卒業論文

    2020
    Institution name:新潟大学

  • 卒業論文Ⅰ

    2020
    Institution name:新潟大学

  • 課題研究(地質科学)

    2020
    Institution name:新潟大学

  • 災害・復興科学演習及び実習

    2020
    Institution name:新潟大学

  • 野外実習A

    2020
    Institution name:新潟大学

  • 地質調査法実習III

    2020
    Institution name:新潟大学

  • フィールドワーカーのためのリスクマネジメント実習

    2020
    Institution name:新潟大学

  • 環境地質学

    2020
    Institution name:新潟大学

  • 地質調査法I

    2018
    Institution name:新潟大学

  • 地質調査法実習I

    2018
    Institution name:新潟大学

  • 環境地質学入門

    2018
    Institution name:新潟大学

  • 地質調査法II

    2018
    Institution name:新潟大学

  • フィールド安全論

    2018
    Institution name:新潟大学

  • 地質調査法実習II

    2018
    Institution name:新潟大学

  • 地質学入門b

    2017
    Institution name:新潟大学

  • 野外実習II

    2017
    Institution name:新潟大学

  • 地盤変動特論

    2013
    Institution name:新潟大学

  • 第四紀・地盤災害特論

    2012
    Institution name:新潟大学

  • 課題研究(地質科学科)

    2012
    -
    2016
    Institution name:新潟大学

  • 環境科学特定研究Ⅰ

    2012
    Institution name:新潟大学

  • 環境科学セミナーⅠ

    2012
    Institution name:新潟大学

  • 第四紀環境学

    2011
    Institution name:新潟大学

  • 課題研究

    2011
    Institution name:新潟大学

  • セミナー

    2011
    Institution name:新潟大学

  • 応用地質学実習

    2011
    -
    2017
    Institution name:新潟大学

  • 地盤変動特論Ⅰ

    2011
    -
    2012
    Institution name:新潟大学

  • 第四紀・地盤災害特論Ⅰ

    2011
    Institution name:新潟大学

  • 自然科学総論Ⅴ

    2010
    -
    2020
    Institution name:新潟大学

  • 文化財学入門

    2009
    -
    2018
    Institution name:新潟大学

  • 野外実習III

    2008
    -
    2018
    Institution name:新潟大学

  • 地盤変動特論Ⅱ

    2008
    -
    2012
    Institution name:新潟大学

  • 第四紀・地盤災害特論Ⅱ

    2008
    -
    2011
    Institution name:新潟大学

  • 環境地質学A

    2007
    -
    2018
    Institution name:新潟大学

  • 地学基礎C

    2007
    -
    2018
    Institution name:新潟大学

  • 環境地質学実習

    2007
    -
    2018
    Institution name:新潟大学

  • 新潟の地質・災害をさぐる

    2007
    -
    2011
    Institution name:新潟大学

  • 災害復興科学

    2007
    -
    2010
    Institution name:新潟大学

  • 第四紀・地盤災害特論II

    2007
    Institution name:新潟大学

  • 地盤変動特論II

    2007
    Institution name:新潟大学

▶ display all