Japan Geoscience Union Meeting 2021

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S (Solid Earth Sciences ) » S-CG Complex & General

[S-CG50] Dynamics in mobile belts

Thu. Jun 3, 2021 5:15 PM - 6:30 PM Ch.15

convener:Yukitoshi Fukahata(Disaster Prevention Research Institute, Kyoto University), Hikaru Iwamori(Earthquake Research Institute, The University of Tokyo), Kiyokazu Oohashi(Graduate School of Sciences and Technology for Innovation, Yamaguchi 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.

5:15 PM - 6:30 PM

[SCG50-P07] Characteristic of fault geometry and the subducting plate boundary in the focal area of the 2016 Mw7.8 Kaikoura earthquake, New Zealand inferred from high precision aftershock distribution

*Yuta Kawamura1, Satoshi Matsumoto1, Tomomi Okada2, Miu Matsuno2, Yoshihisa Iio3, Tadashi Sato2, Stephen Bannister4, John Ristau4, Martha Savage5, Richard Sibson6 (1.Kyushu University, 2.Tohoku University, 3.Kyoto University, 4.GNS Science, 5.Victoria University of Wellington, 6.University of Otago)

5:15 PM - 6:30 PM

[SCG50-P09] Non-double-couple earthquake in the focal area of the 2000 Western Tottori earthquake by “0.1 manten” hyperdense seismic observation

*Takumi Motokoshi1, Satoshi Matsumoto2, Yoshihisa Iio3, Shin'ichi Sakai4, Aitaro Kato4 (1.Department of Earth and Planetary Sciences, Graduate School of Science, Kyushu University, 2.Institute of Seismology and Volcanology, Faculty of Science, Kyushu University, 3.Disaster Prevention Research Institute, Kyoto University, 4.Earthquake Research Institute , the University of Tokyo)

5:15 PM - 6:30 PM

[SCG50-P12] Lithologic and thermal controls of seismicity in the northwestern Kii Peninsula, southern Honshu, Japan

*Sumire Maeda1, Shinji Toda2, Toru Matsuzawa3, Makoto Otsubo4 (1.National Research Institute for Earth Science and Disaster Resilience, 2.International Research Institute of Disaster Science, Tohoku University, 3.Graduate School of Science, Tohoku University, 4.Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology)

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