Shorter intervals between great earthquakes near Sendai: Scour ponds and a sand layer attributable to <scp>A.D.</scp> 1454 overwash

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  • Yuki Sawai
    Geological Survey of Japan National Institute of Advanced Industrial Science and Technology Tsukuba Japan
  • Yuichi Namegaya
    Geological Survey of Japan National Institute of Advanced Industrial Science and Technology Tsukuba Japan
  • Toru Tamura
    Geological Survey of Japan National Institute of Advanced Industrial Science and Technology Tsukuba Japan
  • Rei Nakashima
    Geological Survey of Japan National Institute of Advanced Industrial Science and Technology Tsukuba Japan
  • Koichiro Tanigawa
    Geological Survey of Japan National Institute of Advanced Industrial Science and Technology Tsukuba Japan

書誌事項

公開日
2015-06-19
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/2015gl064167
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>A sparsely documented tsunami in 1454 may subdivide the recurrence interval between the 869 and 2011 tsunamis near Sendai, as judged from geomorphic, stratigraphic, and archival evidence. Pond‐filled breaches cut across beach ridges on century‐old topographic maps. The basal pond deposit in one of these breaches postdates 1454. Stratigraphy on Sendai Plain includes a sand sheet that contains marine and brackish diatoms. Radiocarbon ages suggest that the sheet dates to 1406–1615 (2<jats:italic>σ</jats:italic>), and written records for this interval in Tohoku mention a tsunami in 1454. The inferred inundation extended 1.0–2.5 km inland from an approximate medieval shoreline. Simulated tsunamis that best account for the sand sheet require a thrust earthquake of moment magnitude 8.4 or larger. If the sand sheet represents the 1454 tsunami, the two most recent intervals between great thrust earthquakes in Sendai region spanned 585 and 557 years.</jats:p>

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