Japan Geoscience Union Meeting 2014

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Oral

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[O-03_29AM1] Recent Advances in Earth and Planetary Science

Tue. Apr 29, 2014 9:45 AM - 10:55 AM Main Hall (1F)

Convener:*Tatsuhiko Hara(International Institute of Seismology and Earthquake Engineering, Building Research Institute), Kou Yamada(Waseda University), Hiromi Yokoyama(The University of Tokyo), Chair:Kou Yamada(Waseda University), Hiromi Yokoyama(The University of Tokyo)

9:45 AM - 10:20 AM

★ [O03-01] Hunting mega-quakes -What we can and cannot find out from tsunami deposit-

*Masanobu SHISHIKURA1 (1.Active Fault and Earthquake Research Center, AIST)

Keywords:great earthquake, tsunami, tsunami deposit, paleoseismology

The giant tsunami of 2011 Tohoku was inundated into further inland and transported sand and mud from the coast. Such sand and mud are called tsunami deposit. Researchers have surveyed past tsunami deposits before the 2011 tsunami, and have revealed that the 869 Jogan tsunami had very large inundation in the Tohoku area. Because the inundation area was eventually almost similar between the 2011 and 869, studying past earthquakes and tsunamis (paleoseismology) came to be recognized in its importance for forecasting magnitude of tsunami. However finding out past phenomena beyond several thousand years is not easy. In this talk, I would like to introduce how to reconstruct the past earthquake and tsunami from historical records, tsunami deposits and coastal topography, including episode of field survey and relationship with society.