[S-CG61] Dynamics in mobile belts

Wed. May 28, 2025 1:45 PM - 3:15 PM 103 (International Conference Hall, Makuhari Messe)

convener:Yukitoshi Fukahata(Disaster Prevention Research Institute, Kyoto University), Hikaru Iwamori(Earthquake Research Institute, The University of Tokyo), Kiyokazu Oohashi(National Institute of Advanced Industrial Science and Technology ), Chairperson:Kiyokazu Oohashi(National Institute of Advanced Industrial Science and Technology), Yoshiya Usui(Earthquake Research Institute, the University of Tokyo)

The dynamic behaviors of mobile belts are expressed across a wide range of time scales, from the seismic and volcanic events that impact society during our lifetimes, to orogeny and the formation of large-scale fault systems which can take place over millions of years. Deformation occurs on length scales from microscopic fracture and flow to macroscopic deformation to plate-scale tectonics. To gain a physical understanding of the dynamics of mobile belts, we must determine the relationships between deformation and the driving stresses associated with plate motion and other causes, which are connected through the rheological properties of the materials. To understand the full physical system, an integration of geophysics, geomorphology, geology, petrology, and geochemistry is necessary, as is the integration of observational, theoretical and experimental approaches. In particular, rheological properties, which are physically affected by fluids in the crust and chemical reactions assisted by fluids, can be resolved only through such an interdisciplinary approach. Frequent large earthquakes, such as the 2011 Tohoku-oki, the 2016 Kumamoto, and the 2024 Noto Peninsula Earthquakes, which were accompanied by significant changes in seismic activity and crustal deformation, making present-day Japan a unique natural laboratory for the study of the dynamics of mobile belts. This session welcomes presentations from different disciplines, such as seismology, geodesy, tectonic geomorphology, structural geology, petrology, geochemistry and hydrology, as well as interdisciplinary studies, that relate to the dynamic behaviors of mobile belts.

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1:45 PM - 2:00 PM

[SCG61-01] Crustal structure factors constraining hypocenter distribution in the eastern part of the 2024 Noto Peninsula earthquake, Japan Sea

*Tetsuo No¹, Gou Fujie¹, Yasuyuki Nakamura¹, Tsutomu Takahashi¹, Koichiro Obana¹, Tatsuya Ishiyama², Masaru Ichikawa³, Kenichi Akama³ (1.JAMSTEC, 2.ERI, Univ. of Tokyo, 3.JGI)

2:00 PM - 2:15 PM

[SCG61-02] Characteristics of the resistivity structure around the earthquake swarm activity leading up to the 2024 Noto (Mw7.5) earthquake

*Ryokei Yoshimura¹, Yoshihiro Hiramatsu², Tada-nori Goto³, Takafumi Kasaya⁴, Rintaro Miyamachi¹, Nakagawa Jun¹, Nagi Yamashita³, Rei Amano³, Masato Fukata², Amane Sugii², Mitsuteru Fukuoka², Taisei Inui¹, Kenichi Yamazaki¹, Shintaro Komatsu¹, Takuya Iwahori¹, Masahiro Yoshikawa¹, Yusuke Ohta⁴, Satoshi Ogura⁴, Yoichiro Kitani², Shozo Ogiso², Marin Takasu², Takayuki Okamura², Miku Sakurai³, Ryoichi Kitani³, Ayako Namigishi¹, Nagaoka Airi¹, Yasuto Tatsuyama¹, Akihiro Sawada², Ce Zhang², Yuya Jinde², Yuki Oshima³, Momoka Kanazawa³ (1.Disaster Prevention Research Institute, Kyoto University, 2.Kanazawa University, 3.University of Hyogo, 4.Japan Agency for Marine-Earth Science and Technology)

2:15 PM - 2:30 PM

[SCG61-03] Three-dimensional electrical resistivity structure beneath the Nikko-Ashio area, Northeastern Japan

*Yoshiya Usui¹, Makoto Uyeshima¹, Shin'ya Sakanaka², Yusuke Yamaya³, Yasuo Ogawa^4,5, Masahiro Ichiki⁵, Yoshimori Honkura⁶, Hidekuni Kuroki⁷, Tasuku Hashimoto¹, Hayata Sato⁸, Takao Koyama¹, Koji Miyakawa¹, Akira Watanabe¹, Hiroko Tendo⁸, Masataka Masuda¹, Dieno Diba¹, Han Song^1,9, Kanju Bahati Haji², Kelym Reynald Martinez Mena², Riho Takahashi², Hayato Tazawa², Takuro Kanetsuki⁸, Toshiki Kaida⁵, Yuki Tomioka⁸, Kei Nakayauchi⁸, Takafumi Murakita⁸, Takao Miura⁸, Momoka Yamakawa⁸, Shogo Masuda⁸, Masamichi Ikeda⁸, Yoshiaki Harashima⁸, Taro Nishimoto¹, Shunsuke Yaegashi⁸, Kota Suzuki⁸, Junichi Kitadokoro² (1.Earthquake Research Institute, the University of Tokyo, 2.Graduate School of International Resource Sciences, Akita University, 3.National Institute of Advanced Industrial Science and Technology, 4.Institute of Integrated Research, Institute of Science Tokyo, 5.Graduate School of Science, Tohoku University, 6.Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 7.Seismology and Volcanology Department, Japan Meteorological Agency, 8.Japan Organization for Metals and Energy Security, 9.State Key Laboratory of Marine Geology, Tongji University)

2:30 PM - 2:45 PM

[SCG61-04] Observation of geological structure and rock microstructure associated with strain release along a plate boundary fault

*Yoshiasa Haruki¹, Jun-ichi Ando^1,3, Kaushik Das^1,3, Dyuti Prakash Sarkar², Tomoeki Nakakuki^1,3 (1.Hiroshima University, Graduate School of Advanced Science and Engineering, Earth and Planetary System Science Program, 2.Yamaguchi University Faculty of Science, 3.Hiroshima Institute of Plate Convergence Region Research)

2:45 PM - 3:00 PM

[SCG61-05] Geofluid mapping in the Atotsugawa fault-Takayama area, Central Japan, based on simultaneous analysis of seismic velocities and electrical conductivity

*Hikaru Iwamori¹, Yoshiya Usui¹, Hitomi Nakamura², Noritoshi Morikawa², Chunjie Zhang¹, Junichi Nakajima³ (1.Earthquake Research Institute, The University of Tokyo, 2.Geological Survey of Japan, AIST, 3.School of Science, Institute of Science Tokyo)

3:00 PM - 3:15 PM

[SCG61-06] Nonlinear Coupling of 3D Velocity Heterogeneity and Seismic Potential in the Japan Arc decoded by Machine Learning

*Zhang Chunjie¹, Hikaru Iwamori¹, Aitaro Kato¹, Thomas Yeo², Usui Yoshiya¹ (1.Earthquake Research Institute , The University of Tokyo, 2.Graduate School of Science and Technology, University of Tsukuba)

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