Behavior of historic tsunamis of volcanic origin as revealed by onshore tsunami deposits |
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| Institution: | 1. Géosciences Montpellier, UMR5243, Université Montpellier, Place E. Bataillon, 34095 Montpellier, France;2. Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, CNRS, Paris, France;1. Key Laboratory of Mesoscale Severe Weather/Ministry of Education, School of Atmospheric Sciences, Nanjing University, Nanjing, Jiangsu 210023, China;2. Center for Analysis and Prediction of Storms and School of Meteorology, University of Oklahoma, Norman, OK 73072, USA |
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| Abstract: | According to the old documents, two historic tsunamis of volcanic origin attacked Hokkaido, northern Japan. They are the 1640 Komagatake event which killed more than 700 people and the 1741 Oshima-Ohshima event which killed 1467 people. In order to obtain more information of these old tsunami disasters, we studied onshore tsunami deposits associated with these events. Tsunami deposits are identified by their sedimentary structure and granulometric characteristics. We traced the 1640 and 1741 tsunami deposits showing similar features at outcrops, by making pits or trenches. Minimum runup heights of these historic tsunamis were revealed by these tsunami deposit distributions. Trench survey is one of the best way to find and study onshore paleo-tsunami deposit |
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