JpGU-AGU Joint Meeting 2020

Session information

[E] Oral

S (Solid Earth Sciences ) » S-CG Complex & General

[S-CG61] The Japan Trench: Learning from the 2011 M=9 Tohoku-Oki earthquake, a decade later

convener:Takeshi Iinuma(National Research and Development Agency Japan Agency for Marine-Earth Science and Technology), Asuka Yamaguchi(Atomosphere and Ocean Research Institute, The University of Tokyo), Aitaro Kato(Earthquake Research Institute, the University of Tokyo), Tianhaozhe Sun(Pacific Geoscience Centre, Geological Survey of Canada)

The 2011 Tohoku-Oki earthquake (M=9) and its devastating tsunami triggered numerous new studies of earthquake processes in the northeast Japan subduction zone and worldwide. Multidisciplinary data in great quality and quantity have been collected across the shoreline during and since the earthquake. Important offshore observations include seafloor mapping, sub-seafloor geophysical imaging, coring, logging, and laboratory measurements associated with ocean drilling, GNSS-acoustic measurements of crustal deformation in and beyond the rupture area at an increasing number of sites, and multi-dataset geophysical observations by the newly established cabled seafloor monitoring network (the S-net) that covers the entire offshore area of the margin. Many geophysical and geological studies such as seismological and geodetic analyses, field surveys on fault-zone, regional and margin-wide structures, laboratory experiments on fault-zone and wall rock properties, and the associated numerical modeling have been conducted to investigate the preparation and generation of the M=9 rupture, its postseismic deformation, and its impacts on the general margin geodynamics. Today, approaching a decade from the earthquake, we need to synthesize these results to summarize what we have learned, what is still unknown, and what new studies should be conducted in the future. In this session, we welcome presentations on all aspects of the 2011 Tohoku-Oki earthquake and the seismogenic processes in the Japan Trench and other subduction margins based on, but not limited to, geophysical and geological field observations, laboratory experiments, and modeling studies.

*Ryota Hino1, Naoki Uchida1, Masanao Shinohara2, Yoshihiro Ito3, Takeshi Iinuma4, Yasuyuki Nakamura4, Toshiya Kanamatsu4, Ken Ikehara5, Ryoko Nakata1,4 (1.Graduate School of Science, Tohoku University, 2.Earthquake Research Institute, University of Tokyo, 3.Disaster Prevention Research Institute, Kyoto Univesity, 4.Japan Agency for Marine-Earth Science and Technology, 5.National Institute of Advanced Industrial Science and Technology)

Discussion (5:25 PM - 5:30 PM)