[S-CG44] Science of slow-to-fast earthquakes

Fri. May 27, 2022 3:30 PM - 5:00 PM 103 (International Conference Hall, Makuhari Messe)

convener:Aitaro Kato(Earthquake Research Institute, the University of Tokyo), convener:Yoshiyuki Tanaka(Earth and Planetary Science, The University of Tokyo), Asuka Yamaguchi(Atomosphere and Ocean Research Institute, The University of Tokyo), convener:Takahiro Hatano(Department of Earth and Space Science, Osaka University), Chairperson:Asuka Yamaguchi(Atomosphere and Ocean Research Institute, The University of Tokyo), Yoshitaka Hashimoto(Kochi University)

A growing evidence of geophysical observations has demonstrated that earthquake faults host a broad spectrum of slip modes from slow to unstable fast slip, which may lead to complexity in the nucleation process, rupture behavior, and slip & energy distribution. This discovery has boosted up vigorous discussions about the connection between slow and fast earthquakes including large earthquakes. How and when does a slow earthquake become a fast earthquake? To answer this fundamental question, it is particularly important to proceed further interdisciplinary research through the integration of geophysics, seismology, geodesy, geology, and physics. Developments of measurement technology, application of information science and statistical methods to seismic big-data and utilization of high-performance computing are required as key ingredients in accelerating the integration. This session encourages presentations shedding light on geophysical observations, data analysis, field studies, laboratory experiments, numerical modeling, and theoretical studies. We also welcome contributions from cutting-edge science and technology fields that explore development of novel measurements, data-driven analysis, and large-scale computation etc., those are relevant to slow and fast earthquakes.

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3:30 PM - 3:45 PM

[SCG44-30] Promotion of slow earthquakes by a subducting seamount chain of Kyushu Palau Ridge in Hyuga-Nada

*Rie Nakata¹, Masataka Kinoshita¹, Yoshitaka Hashimoto³, Yohei Hamada², Mudasar Saqab ⁴, Yanxue Ma¹, Kimihiro Mochizuki¹, Yasuyuki Nakamura², Ryuta Arai², Seiichi Miura², Gou Fujie², Paumard Victorian⁵ (1.Unviersity of Tokyo, 2.JAMSTEC, 3.Kochi University, 4.Norwegian Geotechnical Institute, 5.University of Western Australia)

3:45 PM - 4:00 PM

[SCG44-31] Crustal structures revealed by seismic reflection profiles and their relation to seismic activities in the western Nankai Trough

*Kazuya Shiraishi¹, Ryo Miura¹, Yohei Hamada¹, Yanxue Ma², Fujio Yamamoto¹, Seiichi Miura¹, Ryuta Arai¹, Yasuyuki Nakamura¹, Gou Fujie¹, Shuichi Kodaira¹, Masataka Kinoshita², Yoshitaka Hashimoto³, Rie Nakata², Kimihiro Mochizuki² (1.Japan Agency for Marine-Earth Science and Technology, 2.Earthquake Research Institute, The University of Tokyo, 3.Kochi University)

4:00 PM - 4:15 PM

[SCG44-32] Interpretations of shallow structures in Hyuga-Nada, Southwest Japan: Effect of Kyushu-Palau Ridge subduction

*Yoshitaka Hashimoto¹, Fukubeppu Wataru¹, Yuka Senoo¹, Rie Nakata², Masataka Kinoshita², Yohei Hamada³, Kimihiro Mochizuki², Ryuta Arai³, Ryo Miura³, Yasuyuki Nakamura³, Gou Fujie³, Ma Yanxue², Shuichi Kodaira³ (1.Kochi University, 2.ERI, University of Tokyo, 3.JAMSTEC)

4:15 PM - 4:30 PM

[SCG44-33] Geological structure and mechanical properties due to the collision of multiple seamounts in a accretionary wedge: insights from numerical simulations

*Ayumu Miyakawa¹, Atsushi Noda¹, Hiroaki Koge¹ (1.Institute of Geology and Geoinformation , Geological Survey of Japan, AIST)

4:30 PM - 4:45 PM

[SCG44-34] Subsurface deformations related to seamount subduction at the toe of the Nankai accretionary prism off Kumano

*Asuka Yamaguchi¹, Yuichi Okuma¹, Rina Fukuchi², Juichiro Ashi¹, Gaku Kimura³ (1.Atomosphere and Ocean Research Institute, The University of Tokyo, 2.Naruto University of Education, 3.JAMSTEC)

4:45 PM - 5:00 PM

[SCG44-35] Forearc Basin Separation, Inner Wedge Structure, and Megathrust Segmentation of the Nankai Forearc, Japan

*Gaku Kimura¹, Yasuyuki Nakamura¹, Kazuya Shiraishi¹, Gou Fujie¹, Shuichi Kodaira¹, Takeshi Tsuji², Rina Fukuchi³, Asuka Yamaguchi⁴ (1.Japan Agency for Marine-Earth Science and Technology, 2.Kyushu University, 3.Naruto University of Education, 4.Atmosphere and Ocean Research Institute, The University of Tokyo)

Session information