Hydro-sedimentological study on running-up currents by the 2011 Tohoku-Oki tsunami
Project/Area Number |
24651196
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Research Category |
Grant-in-Aid for Challenging Exploratory Research
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Allocation Type | Single-year Grants |
Research Field |
Natural disaster science
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Research Institution | Tohoku University |
Principal Investigator |
MINOURA Koji 東北大学, 理学(系)研究科(研究院), 教授 (10133852)
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Project Period (FY) |
2012-04-01 – 2014-03-31
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Project Status |
Completed (Fiscal Year 2013)
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Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2012: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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Keywords | 海水遡上 / 津波堆積物 / 引き波 / 堆積作用 / 侵蝕作用 / 水理堆積学 / 東北日本沖太平洋地震津波 / 海水溯上 |
Research Abstract |
I have studied the tsunami deposits produced by the 869 Jogan and the 2011 Tohoku-Oki earthquake tsunamis for the purpose of making clear the hydro-sedimentological effect of vegetation and micro-topography on running-up currents. Micropareontological data were very useful for identifying the origin of sediments by the tsunamis. The results infer the laminated sand layer found at the base of the tsunami deposits to represent deposition under supercritical flow conditions. Each layer of the laminated sand shows inverse grading, and lamina sets display a stack of thin layers, which are produced by flows with high grain concentrations. The dominant occurrence of saltwater and brackish water species and the high percentage of perfect frustules indicate that the laminated sand was deposited by flows of water originating in the foreshore. The results has confirmed the hydrogeological framework of running-up currents by the 2011 Tohoku-Oki tsunami.
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Report
(3 results)
Research Products
(27 results)
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[Journal Article] Geological evidence of tsunamis and earthquakes at the Eastern Hellenic Arc: correlation with historical seismicity in the eastern Mediterranean Sea.2012
Author(s)
Papadopoulos, G., Minoura, K., Imamura, F., Kuran, U., Yalciner, A., Fokaefs, A., and Takahashi, T.
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Journal Title
Research in Geophysics
Volume: 2
Issue: 2
Pages: 90-99
DOI
Related Report
Peer Reviewed
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[Presentation] 古地震の復元
Author(s)
箕浦幸治
Organizer
2012年日本自然災害学会
Place of Presentation
弘前大学
Related Report
Invited
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