[S-CG52] Dynamics in mobile belts

Fri. May 27, 2022 10:45 AM - 12:15 PM 301A (International Conference Hall, Makuhari Messe)

convener:Yukitoshi Fukahata(Disaster Prevention Research Institute, Kyoto University), convener:Hikaru Iwamori(Earthquake Research Institute, The University of Tokyo), Kiyokazu Oohashi(Graduate School of Sciences and Technology for Innovation, Yamaguchi University), Chairperson:Kiyokazu Oohashi(Graduate School of Sciences and Technology for Innovation, Yamaguchi University), Tomomi Okada(Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University)

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. After the 2011 great Tohoku-oki earthquake, large-scale changes in seismic activity and regional scale crustal deformation were observed, 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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10:45 AM - 11:00 AM

[SCG52-07] Does electrical conductivity profile reflect the intensity of deformation?

*Tohru Watanabe¹, Hayato Hitotsumatsu² (1.Faculty of Sustainable Design, University of Toyama, 2.Graduate school of science and engineering, University of Toyama)

11:00 AM - 11:15 AM

[SCG52-08] Three-dimensional electrical resistivity structure beneath the back-arc side of the southern Tohoku region

*Yoshiya Usui¹, Makoto Uyeshima¹, Hideaki Hase², Hiroshi Ichihara³, Koki Aizawa⁴, Takao Koyama¹, Shin'ya Sakanaka⁵, Tsutomu Ogawa¹, Yusuke Yamaya⁶, Tadashi Nishitani⁵, Koichi Asamori⁷, Yasuo Ogawa⁸, Ryokei Yoshimura⁹, Shinichi Takakura¹⁰, Masaaki Mishina¹¹, Yuichi Morita¹² (1.Earthquake Research Institute, the University of Tokyo, 2.Geothermal Energy Research & Development Co., Ltd., 3.Graduate School of Environmental Studies, Nagoya University, 4.Institute of Seismology and Volcanology, Faculty of Science, Kyushu University, 5.Faculty of Engineering and Resource Science, Akita University, 6.Renewable Energy Research Center, Fukushima Renewable Energy Institute, National Institute of Advanced Industrial Science and Technology, 7.Tono Geoscience Center, Japan Atomic Energy Agency, 8.Volcanic Fluid Research Center, Tokyo Institute of Technology, 9.Disaster Prevention Research Institute, Kyoto University, 10.Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, 11.Graduate School of Science, Tohoku University, 12.Center for Integrated Volcano Research, National Research Institute for Earth Science and Disaster Resilience)

11:15 AM - 11:30 AM

[SCG52-09] Measurement of seismic velocity anisotropy in the Tohoku region using shear wave splitting analysis (5) - Possible change associated with the Tohoku-Oki earthquake

Tatsuya Mizuta¹, *Tomomi Okada¹, Martha Savage², Ryota Takagi¹, Keisuke Yoshida¹, Shinichi Sakai³, Kei Katsumata⁴, Mako Ohzono^4,3, Masahiro Kosuga⁵, Takuto Maeda⁵, Yoshiko Yamanaka⁶, Hiroshi Katao⁷, Takeshi Matsushima⁸, Hiroshi Yakiwara⁹, Takashi NAKAYAMA¹, Satoshi Hirahara¹, Toshio Kono¹, Toru Matsuzawa¹, Group for the aftershock observations of the 2011 off the Pacific coast of Tohoku Earthquake (1.Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University, 2.Victoria University of Wellington, 3.ERI, University of Tokyo, 4.Hokkaido University, 5.Hirosaki University , 6.Nagoya University, 7.DPRI, Kyoto University, 8.Kyushu University, 9.Kagoshima University)

11:30 AM - 11:45 AM

[SCG52-10] Experimental verification of densification without shear-induced fabric along plate boundary décollement

*Yuzuru Yamamoto¹, Yudai Suzuki², Yuhei Kurimoto³, Feng Zhang², Hide Sakaguchi⁴ (1.Kobe University, 2.Nagoya Institute of Tecnology, 3.Shimizu Corporation, 4.OPRI, Sasagawa Peace Foundation)

11:45 AM - 12:00 PM

[SCG52-11] Simultaneous intrusion of the Ashizuri Granite and deposition of the Misaki Group basin sediments; results from 1D thermal modeling.

*Shiho Nishizawa¹, Yasutomo Omori², Weiren Lin³, Stephen Alan Bowden^5,4, Yuzuru Yamamoto¹ (1.Kobe Univ., 2.JAMSTEC, 3.Kyoto Univ., 4.University of Aberdeen, 5.KOBEC)

12:00 PM - 12:15 PM

[SCG52-12] Toward a quantitative analysis of inelastic crustal deformation: performance evaluation of elastic prediction method

*Arong BAI¹, Takeshi SAGIYA^1,2 (1.Graduate School of Environmental Studies, Nagoya University, 2.Disaster Mitigation Research Center, Nagoya University)

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