JpGU-AGU Joint Meeting 2020

Session information

[E] Poster

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.

*Toshiya Fujiwara1,9, Shuichi Kodaira1, Gou Fujie1, Yuka Kaiho1, Toshiya Kanamatsu1, Takafumi Kasaya2, Yasuyuki Nakamura1, Tetsuo No1, Tsutomu Takahashi1, Takeshi Sato3, Narumi Takahashi4,1, Yoshiyuki Kaneda5,1, Katharina Bachmann6, Christian dos Santos Ferreira6, Gerold Wefer6, Michael Strasser7, Tianhaozhe Sun8 (1.Research Institute for Marine Geodynamics, Japan Agency for Marine-Earth Science and Technology, 2.Research Institute for Marine Resources Utilization, Japan Agency for Marine-Earth Science and Technology, 3.Sapporo Regional Headquarters, Japan Meteorological Agency, 4.National Research Institute for Earth Science and Disaster Resilience, 5.Kagawa University, 6.MARUM, University of Bremen, 7.Institute of Geology, University of Innsbruck, 8.Pacific Geoscience Centre, Geological Survey of Canada, 9.Kochi University)

*Jih-Hsin Chang1, Jin-Oh Park2, Tzu-Ting Chen3, Asuka Yamaguchi2, Tetsuro Tsuru4, Yuji Sano2, Ho-Han Hsu3, Kotaro Shirai2, Takanori Kagoshima2, Kentaro Tanaka2, Chiori Tamura2 (1.Geological Survey of Japan, National Institute of Advanced Industrial and Science Technology., 2.Atmosphere and Ocean Research Institute, The University of Tokyo., 3.Institute of Oceanography, National Taiwan University., 4.Tokyo University of Marine Science and Technology.)