Faculty Profiles - URABE Atsushi

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

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

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

Tsunamis caused by offshore active faults and their deposits

Yasuhiro Takashimizu, Gentaro Kawakami, Atsushi Urabe

Earth-Science Reviews 211 103380 - 103380 2020.12

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

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

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

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

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

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

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

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

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

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

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

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 (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

DOI： 10.5026/jgeography.127.357_references_DOI_Ss96ekqlII9MC5v2IFIbZ6YfGVP

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

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

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

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

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

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

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

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

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

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

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

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

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.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.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.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.

DOI： 10.4116/jaqua.56.37

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

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

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

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.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.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).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.

DOI： 10.5575/geosoc.2017.0054

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

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

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

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

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.

DOI： 10.5575/geosoc.2016.0042

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

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

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

(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

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

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

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

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

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

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

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

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

Urabe Atsushi, S. Kataoka Kyoko

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

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

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.

DOI： 10.4116/jaqua.52.241

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

Other Link： https://jlc.jst.go.jp/DN/JALC/10027165606?from=CiNii

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

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

YATA Toshifumi, URABE Atsushi

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

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

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

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

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. 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. 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. 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

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

Other Link： https://jlc.jst.go.jp/DN/JALC/00380388842?from=CiNii

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

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

YATA Toshifumi, URABE Atsushi

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

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

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japanese Society for Active Fault Studies

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.

DOI： 10.11462/afr.2010.32_9

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

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

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

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

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

Language：Japanese Publisher：The Association for the Geological Collaboration in Japan

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

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

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

Urabe Atsushi

The Quaternary Research 47 ( 3 ) 191 - 201 2008.7

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

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.

DOI： 10.4116/jaqua.47.191

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

Other Link： https://jlc.jst.go.jp/DN/JALC/00315111699?from=CiNii

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

baba ayaka, urabe atsushi, kataoka kyoko.s

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

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

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

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Association for the Geological Collaboration in Japan

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

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

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

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

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

Earth Scien 60 ( 6 ) 465 - 479 2006.12

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Association for the Geological Collaboration in Japan

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

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

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

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

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

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 km2) 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.

DOI： 10.5575/geosoc.112.188

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

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

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

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

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

HIRAMATSU Yukiko, YASUI Satoshi, URABE Atsushi, HONGO Misao

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

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

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

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

Other Link： https://jlc.jst.go.jp/DN/JALC/00255202631?from=CiNii

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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.

DOI： 10.4116/jaqua.41.185

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

Other Link： https://jlc.jst.go.jp/DN/JALC/00156953762?from=CiNii

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

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

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

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

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.

DOI： 10.4116/jaqua.41.45

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Association for the Geological Collaboration in Japan

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

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

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

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

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

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

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

Urabe Atsushi

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

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Association for the Geological Collaboration in Japan

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

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

Language：Japanese Publisher：Japan Association for Quaternary Research

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. 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. (1) The seismic profiles show concealed faults below the shallow subsurface deposits in the coastal plain. (2) Remarkably steep gradients of Bouguer anomalies are distributed along the boundary of the Rokko mountains and the plain. (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. 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