2011 Fiscal Year Final Research Report
Detection of tsunami flooding and geochemical estimates of seawater influx
| Project/Area Number |
22651066
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Single-year Grants |
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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, 大学院・理学研究科, 教授 (10133852)
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| Project Period (FY) |
2010 – 2011
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| Keywords | 津波 / 溯上流 / 海水氾濫 / 海水陸水混合 / 化学痕跡 |
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| Research Abstract |
Lacustrine deposits of the Pacific coast of northeast Japan contain intercalated thin beds of well-sorted medium sand. Examination of the deposits from a coastal site of Sanriku has revealed that sand grains are of marine origin and are fractions of deposits in marshy ponds, transported from the littoral environment by a great flooding of seawater. The mode of sedimentation shown in the thin beds of sand implies that they were deposited by tsunamis, each with a maximum rise of 1 m or more above sea level.
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