Elucidation of sedimentological mechanism of gravity flows by tsunamis
| Project/Area Number |
23310118
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Natural disaster science
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| Research Institution | Tohoku University |
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Principal Investigator |
MINOURA Koji 東北大学, 理学(系)研究科(研究院), 教授 (10133852)
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| Co-Investigator(Kenkyū-buntansha) |
IMAMURA Fumihiko 東北大学, 災害科学国際研究所, 教授 (40213243)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥20,410,000 (Direct Cost: ¥15,700,000、Indirect Cost: ¥4,710,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2012: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2011: ¥14,690,000 (Direct Cost: ¥11,300,000、Indirect Cost: ¥3,390,000)
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| Keywords | 津波 / 押し波 / 引き波 / 重力流 / 密度流 / 溯上流 / 戻り流れ / 堆積作用 / 海底地滑り |
|---|
| Research Abstract |
Sedimentological and micropaleontological analyses of terrestrial and nearshore to offshore sediments recovered from the coast of the Sendai Bay were performed to clarify the processes of sediment transport and deposition by the tsunami retreat. The distribution pattern of sediment grains and diatom frustules showed seaward migration after the tsunami event. It has been suggested that sediments originally distributed in terrestrial and coastal zones were transported offshore due to the tsunami backwash. The distribution pattern of planktonic and benthic species living in offshore zones showed slight evidence of landward migration by the tsunami. This suggests that landward redistribution of sediments by the tsunami run-up did not occur in the offshore seafloor of the study area. It is possible that tsunami backwashes induce sediment flows that transport a large amount of coastal materials seaward.
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Report
(4 results)
Research Products
(40 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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[Journal Article] Emplacement and movement of boulders by known storm waves - Field evidence from the Okinawa Islands, Japan2011
Author(s)
Goto, K., Miyagi, K., Kawana, T., Takahashi, J., and Imamura, F.
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Journal Title
Marine Geology
Volume: vol. 283
Pages: 66-78
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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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[Book] 地球進化論2011
Author(s)
平, 阿部, 川上, 清川, 有馬, 田近, 箕浦(共著)
Publisher
岩波書店
Related Report
