Paleo-tsunami and the 2011 Tsunami Deposits on the Sendai Coastal Lowland, Northeast Japan(<Featured Articles>Mega-Earthquake and Geomorphic Hazards)

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概要

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• Sendai Coastal Lowland is located in Miyagi Prefecture, facing the Pacific Ocean. The authors found paleo-tsunami deposits at the Kutsukata Archaeological Site in 2006. The site is located 4.3 km from the present shoreline. The tsunami deposit is distributed as a well-sorted sand layer with thickness 2-12 cm. The grain-size characteristics are almost same as present beach deposits. The age of the paleo-tsunami deposit was around 2000 yrBP. And the continuity of the tsunami deposit from the landward limit to the paleo-shore line was confirmed. On March 11, 2011, the mega-tsunami struck the Pacific coast of northeast Japan. The wave ran-up and the inundation area reached about 4 km from the shoreline. The authors recognized that the tsunami deposit was composed by sand and clay materials. The sand was distributed up to 2.3 km in distance from the shoreline. That was 60% of the total inundation distance. Based on these facts, total inundation distance of the tsunami of 2000 yr BP was calculated to be 4.2 km.

• 2012-10-25

著者

• MATSUMOTO Hideaki

  Tohoku Gakuin University

• YOSHIDA Masayuki

  Toa Road Corporation

• KUMAGAI Maki

  c/o Division of Regional Management, Tohoku Gakuin University

関連論文

• P13. Ground Failure and Building Damage caused by Miyagiken-Hokubu Earthquake in 2003, Northeast Japan(Abstracts of Papers Presented at the Fall Meeting of the Union, December 2004)
• Paleo-tsunami and the 2011 Tsunami Deposits on the Sendai Coastal Lowland, Northeast Japan(Mega-Earthquake and Geomorphic Hazards)
• Paleo-tsunami and the 2011 Tsunami Deposits on the Sendai Coastal Lowland, Northeast Japan

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