Faculty Profiles - URABE Atsushi

Papers - URABE Atsushi

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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

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

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

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 (<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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CiNii Books

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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

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

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Papers - URABE Atsushi