[U-02] Ten years from the 2011 Tohoku Earthquake: A milestone of earth science

[U02-09] Study of giant tsunamis based on geological data in the future

★Invited Papers

*Yukinobu Okamura¹ (1.Research Institute of Earthquake and Vocano Geology, National Institute of Advanced Industrial Science and Technology)

Keywords:paleoseismological data, giant tsunami, Nankai Trough

Before the 2011 Tohoku earthquake, giant tsunami models had been proposed along the Kuril and the Japan Trenches based on tsunami deposit data. Unprecedented tsunami had been inferred by tsunami deposits studies along the Nankai Trough. Unfortunately, these studies had not had much attention. The 2011 Tohoku giant earthquake revealed the significance of the tsunami deposits as records of ancient giant tsunamis. Many tsunami deposits indicating ancient giant tsunamis have been reported from coastal areas of Japan after the 2011 giant tsunamis. Government has constructed source models of the largest-possible tsunami along the coastal areas of Japan, and the survey data of tsunami deposits have provided important information to construct the models. We need to understand that some high-quality survey data of tsunami deposits have important information of tsunami sources that have not been used well. Using this information, it may be possible to confirm different types of the plate boundary earthquakes along the Nankai Trough and to infer the type of the next earthquake from tsunami deposits and other paleo-seismological data.