The 869 Jogan tsunami deposit and recurrence interval of large-scale tsunami on the Pacific coast of northeast Japan

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概要

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• The fore-arc region of northeast Japan is an area of extensive seismic activity and tsunami generation. On July 13, 869 a tsunami triggered by a large-scale earthquake invaded its coastal zones, causing extensive deposition of well-sorted fine sand over the coastal plains of Sendai and Soma. Sediment analysis and hydrodynamic simulation indicate that the tsunami inferred to be triggered by a magnitude 8.3 earthquake spread more than 4 km inland then coast. We postulate that the sand layer was developed by the tsunami's first wave. Traces of large-scale invasion by old tsunami as recorded in the coastal sequences of the Sendai plain show about a 1000-year reoccurrence interval. We suggest that the Jogan tsunami was much larger than tsunami generated by normal earthquakes in the subduction interface.

• 日本自然災害学会の論文

著者

• Minoura K.

  Institute Of Geology And Paleontology Graduate School Of Science Tohoku University

• IMAMURA F.

  Disaster Control Research Center, Graduate School of Engineering, Tohoku University

• SUGAWARA D.

  Institute of Geology and Paleontology, Graduate School of Science, Tohoku University

• KONO Y.

  Department of Civil Engineering, Tohoku-Gakuin University

• IWASHITA T.

  Institute of Geology and Paleontology, Graduate School of Science, Tohoku University

• Sugawara D.

  Institute Of Geology And Paleontology Graduate School Of Science Tohoku University

• Kono Y

  Kyoto Univ.

関連論文

• The 869 Jogan tsunami deposit and recurrence interval of large-scale tsunami on the Pacific coast of northeast Japan

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