[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.

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[SCG61-06] Seismicity in the trench-outer rise region along the Japan Trench based on repeated OBS observations: Implications for large outer-rise earthquakes

*Koichiro Obana¹, Gou Fujie¹, Yasuyuki Nakamura¹, Tsutomu Takahashi¹, Yojiro Yamamoto¹, Takashi Tonegawa¹, Yuka Kaiho¹, Seiichi Miura¹, Shuichi Kodaira¹ (1.Research Institute for Marine Geodynamics, Japan Agency for Marine-Earth Science and Technology)

[SCG61-07] Head and tail of massive earthquakes: Mechanism arresting growth of interplate earthquakes

*Ryota Hino¹, Naoki Uchida¹, Masanao Shinohara², Yoshihiro Ito³, Takeshi Iinuma⁴, Yasuyuki Nakamura⁴, Toshiya Kanamatsu⁴, Ken Ikehara⁵, Ryoko Nakata^1,4 (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)

[SCG61-08] Development of GNSS-A in this decade and observation results along the Japan Trench

★Invited Papers

*Yusuke Yokota¹, Tadashi Ishikawa², Shun-ichi Watanabe², Yuto Nakamura² (1.Institute of Industrial Science, The University of Tokyo, 2.Hydrographic and Oceanographic Department, Japan Coast Guard)

[SCG61-09] On the cause of enhanced landward motion of the overriding plate after the Tohoku-Oki earthquake

Mario D'Acquisto¹, Matthew Herman¹, *Rob Govers¹ (1.Utrecht University, Netherlands)

[SCG61-10] Elucidation of locking state at the shallower plate boundary after the Tohoku Earthquake based on seafloor acoustic ranging

*Ryusuke Yamamoto^1,2, Ryota Hino¹, Motoyuki Kido³, Chie Honsho¹, Shuichi Kodaira⁴, Yasuyuki Nakamura⁴ (1.Graduate School of Science, Tohoku University, 2.Tokio Marine & Nichido Risk Consulting Co., Ltd., 3.International Research Institute of Disaster Science, Tohoku University, 4.Japan Agency for Marine-Earth Science and Technology)

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