Paleo-tsunami deposit research on the Sanriku Coast since the 2011 Tohoku-oki earthquake

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  • 三陸海岸における2011年東北地方太平洋沖地震後の古津波堆積物研究
  • サンリク カイガン ニ オケル 2011ネン トウホク チホウ タイヘイヨウオキ ジシン ゴ ノ コ ツナミ タイセキブツ ケンキュウ

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Abstract

<p>Before the 2011 Tohoku-oki earthquake, long-term tsunami history along the Sanriku Coast was not well understood. After the 2011 tsunami event, exhaustive tsunami deposit research revealed the number and distribution of tsunami deposits on the Sanriku Coast, which was thought not to be an appropriate site for paleo-tsunami deposit survey. Especially, tsunami deposits related to two historical tsunamis, the 1611 Keicho Sanriku tsunami and the 869 Jogan tsunami, were widely identified on the coast. Moreover, distribution and ages of older tsunami deposits were also revealed, and some tsunami deposits show similar age. In the future, for understanding magnitude and source of paleo-tsunamis, we need to establish a method for correlation of paleo-tsunami deposits from each site and to study the details of paleo-tsunami deposits.</p>

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