Preparations for the Coming Large Earthquakes at the Nankai Trough. Recurrence Interval of Large Earthquakes Along the Eastern Nankai Trough Inferred from Deep-sea Turbidites.

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  • IKEHARA Ken
    Institute for Marine Resources and Environment, National Institute of Advanced Industrial Science and Technology

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  • 次の南海トラフ巨大地震に備えて　　深海底タービダイトを用いた南海トラフ東部における地震発生間隔の推定
  • シンカイテイ タービダイト オ モチイタ ナンカイ トラフ トウブ ニ オケル ジシン ハッセイ カンカク ノ スイテイ

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Deep-sea turbidite has potential for paleoseismicity analysis. Many deep-sea turbidites were intercalated in two sediment cores collected from two slope basins off Tokai area along the eastern Nankai Trough. Geological and topographic setting of the basins suggests that these turbidites were of earthquake origin. Depositional age of each turbidite layer was determined by radiocarbon dating using planktonic foraminifera in hemipelagic mud. The results indicated that large earthquakes along the eastern Nankai Trough might have occur periodically every 100-150 years during the last 3000 years.

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