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Identification and possible recurrence of an oversized tsunami on the Pacific coast of northern Japan

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  • Koji Minoura
  • Shin-ichi Hirano
  • Tsutomu Yamada

Abstract

Geological evidence of severe tsunami inundation has been discovered in northern Japan. In the dune fields of Shimokita, in northernmost Tohoku, we have found two distinctive sand layers that are tsunami deposits. The run-up height of >20 m and inland inundation of at least 1.4 km are notably larger than any known historical case in Japan. The tsunami-genic earthquake that resulted in these deposits is thought to have taken place in the Kuril Forearc-Trench system nearly 700 years ago. The recurrence interval of major tsunamis originating in the Kuril subduction zone is about 400 years. Given that the most recent unusually large earthquake took place in AD 1611 (corresponding to the Keicho earthquake tsunami), the findings presented here increase the potential and hazard for an outsized tsunami striking the Pacific coast of northern Japan. Copyright Springer Science+Business Media Dordrecht 2013

Suggested Citation

  • Koji Minoura & Shin-ichi Hirano & Tsutomu Yamada, 2013. "Identification and possible recurrence of an oversized tsunami on the Pacific coast of northern Japan," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 68(2), pages 631-643, September.
    • Handle: RePEc:spr:nathaz:v:68:y:2013:i:2:p:631-643
    DOI: 10.1007/s11069-013-0640-z
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