Hazard mapping based on terrain chronology and gravitational slope deformation ratio
| Project/Area Number |
16K01211
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Geography
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| Research Institution | Yamagata University |
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Principal Investigator |
YAGI Hiroshi 山形大学, 地域教育文化学部, 教授 (40292403)
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| Co-Investigator(Kenkyū-buntansha) |
佐藤 浩 日本大学, 文理学部, 准教授 (60360468)
若井 明彦 群馬大学, 大学院理工学府, 教授 (90292622)
松四 雄騎 京都大学, 防災研究所, 准教授 (90596438)
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| Research Collaborator |
Dangol V. Trivban University, Trichandra Campus, Prof.
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Keywords | Himalaya / 重力変形 / 地すべり / 地形発達 / 下刻 / 土石流 / 最終氷期後半 / 地変 / ヒマラヤ / 宇宙線生成核種蓄積年代 / ヒマラヤ最大級地すべり / 氷河地域由来土石流段丘 / 地震起源転石 / 組織地形としての高位平坦面 / 地すべり地形 / 空中写真判読 / 放射線蓄積量年代測定 / InSAR / 地震動変形 / 地形編年 / 下刻速度 / 重力性斜面変形速度 / 防災マップ |
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| Outline of Final Research Achievements |
Geomorphological evolution in the Midland, Nepal Himalaya, since the Last Glacial Age is characterized by catastrophic topographic change such as deepening and filling by detritus occurred alternately. Highest terrace in the study area are distributed at the relative height of 100-150m from the present river bed and are formed by detritus derived from the Great Himalayan side. And they were dated back to 20-30ka by OSL method. Middle terrace formed by debris flow deposits is dated back to 4ka. Such detritus were derived from Great Himalaya as sudden breach of landslide dams. Trace of the long traveled debris flows implies catastrophic disaster might occur due to climatic and seismic events in near future.
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| Academic Significance and Societal Importance of the Research Achievements |
起伏が急変するネパール・大ヒマラヤ山麓部の河谷では，過去数万年から数千年の時間オーダーで年間6ー12mm程度の下刻が起こり，それに伴われて斜面の重力性変形も進んできた．その結果，10億立方mクラスの地すべり・山体崩壊が発生したり，地すべりに伴う岩屑が土石流として下流側に流入し河谷を埋積してきた．このような急速な下刻・埋積のサイクルは最終氷期後半以降少なくとも2回発生したことを明らかにしたことは学術的な意義がある．さらに，厚さ40m以上の土石流が30-40kmに亘って長距離流下することを明らかにしたことは，今後のハザードマップの作成に貢献できる．
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Report
(4 results)
Research Products
(36 results)
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[Journal Article] The 2015 Gorkha Earthquake: Earthquake Reflection Imaging of the Source Fault and Connecting Seismic Structure With Fault Slip Behavior2019
Author(s)
Kurashimo, E., Sato1,H., Sakai, S., Hirata, N., Gajure, A.P., AdhikariD.P. , Subedi, K.P., Yagi, H. and Upreti, B. N.
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Journal Title
Geophysical Research Letters
Volume: 46
Issue: 6
Pages: 3202-3215
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Topographic characteristics of landslides induced by the 2015 Gorkha earthquake2018
Author(s)
Tsou, C.Y., Higaki, D., Chigira, M., Yagi, H., Dangol, V., Amatya, S.C., Hayashi., K., Kato, H.
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Journal Title
Journal of Nepal Geological Society
Volume: 55
Pages: 69-75
Related Report
Peer Reviewed
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[Journal Article] Topographic and geologic controles on landslides induced by the 2015 Gorkha earthquake and its aftershoks: an example from the Trishuli Valley, central Nepal. Landslides2017
Author(s)
Tsuo, C-Y., Chigira, M., Higaki, D., Sato,G., YAGI, H., Sato,P.H., Wakai, A., Dangol, V., Amatya, S.C. and Yatagai, A.
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Journal Title
Journal of the International Consortium on Landslides
Volume: vol.0
Issue: 5
Pages: 1-13
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Anomalous winter snow amplified earthquake induced disaster of the 2015 Langtang avalanche in Nepal2017
Author(s)
Fujita, K., Inoue, H., Izumi, T., Yamaguchi, S., Sadakane, A., Sunako, S., Nishimura, K., Immerzeel, W. W., Shea, J. M., Kayashta, R. B., Sawagaki, T., Breashears, D. F., Yagi, H., and Sakai, A.
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Journal Title
Nat. Hazards Earth Syst. Sci.
Volume: Discussion
Pages: 1-27
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Presentation] Landslide mapping in Nepal: the impacts of the 2015 Gorkha earthquake and the subsequent monsoon2016
Author(s)
Tsou, C., Higaki, D., Chigira, M., Yagi, H., Sato, H. Sato, G., Wakai, A., Yamasaki, S. and Yatagai, A.
Organizer
JpGU Meeting 2016
Place of Presentation
千葉市幕張メッセ
Year and Date
2016-05-24
Related Report
Int'l Joint Research
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