[S-CG57] Dynamics in mobile belts

Wed. May 23, 2018 1:45 PM - 3:15 PM A05 (Tokyo Bay Makuhari Hall)

convener:Yukitoshi Fukahata(Disaster Prevention Research Institute, Kyoto University), Toru Takeshita(Department of Natural History Sciences, Graduate School of Science, Hokkaido University), Hikaru Iwamori(海洋研究開発機構・地球内部物質循環研究分野), Chairperson:Muto Jun, Noda Akemi

The dynamic behaviours 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 due to 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, and geology is necessary, as is the integration of observational, theoretical and experimental approaches. In addition, because rheological properties are greatly affected by fluids in the crust and fluid chemical reactions, petrological and geochemical approaches are also important. 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, and geofluids, as well as interdisciplinary studies, that relate to the dynamic behaviour of mobile belts.

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1:45 PM - 2:00 PM

[SCG57-25] Kinematic history along the Hinagu fault zone, Kumamoto Prefecture, Kyushu, Japan

*Kenta Kobayashi¹, Keiji Ogashiwa¹, Keita Takahashi², Shun Suzuki², Yumeki Hoshika², Naoki Takahashi¹, Chihiro Takahashi¹ (1.Department of Geology, Faculty of Science, Niigata University, 2.Graduate School of Science and Technology, Niigata University)

2:00 PM - 2:15 PM

[SCG57-26] Change in state of stress around Hinagu fault zone through the 2016 Kumamoto earthquake sequence, central Kyushu, Japan

*Ayaho Mitsuoka¹, Satoshi Matsumoto², Yusuke Yamashita³, Manami Nakamoto⁴, Masahiro Miyazaki³, Shin'ichi Sakai⁵, Yoshihisa Iio³, Group for urgent joint seismic observation of the 2016 Kumamoto earthquake (1.Department of Earth and Planetary Sciences, Graduate School of Science, Kyushu University, 2.Institute of Seismology and Volcanology, Faculty of Sciences, Kyushu University, 3.Disaster Prevention Research Institute, Kyoto University, 4.National Institute of Polar Research, 5.Earthquake Research Institute, The University of Tokyo)

2:15 PM - 2:30 PM

[SCG57-27] Transient Deformation Following the 2016 Kumamoto Earthquake: Towards Building a Rheological Model of Kyushu

*James Daniel Paul Moore^1,2, Eric Lindsey^1,2, Hang Yu², Justin Dauwels², Satoshi Matsumoto³, Bunichiro Shibazaki⁴ (1.Earth Observatory of Singapore, 2.Nanyang Technological University, 3.Kyushu University, 4.Building Research Institute)

2:30 PM - 2:45 PM

[SCG57-28] Crustal stress accumulation and release estimated from elastic/inelastic strain analysis: the 2016 Kumamoto earthquake

*Akemi Noda¹, Tatsuhiko Saito¹, Eiichi Fukuyama¹, Mitsuhiro Matsu'ura² (1.National Research Institute for Earth Science and Disaster Resilience, 2.Institute of Statistical Mathematics)

2:45 PM - 3:00 PM

[SCG57-29] The role of power-law viscoelastic flow and fault friction in post-earthquake deformation after the 2011 Tohoku-Oki earthquake

*Ryoichiro Agata¹, Sylvain Barbot³, Kohei Fujita², Mamoru Hyodo¹, Takeshi Iinuma¹, Ryoko Nakata¹, Tsuyoshi Ichimura², Takane Hori¹ (1.Japan Agency for Marine-Earth Science and Technology, 2.The University of Tokyo, 3.Nanyang Technological University)

3:00 PM - 3:15 PM

[SCG57-30] Nonlinear mechanical coupling between viscoelastic relaxation and deep afterslip in the post-seismic deformation of the 2011 Tohoku-oki earthquake

*Jun Muto¹, James Daniel Paul Moore², Sylvain Barbot², Takeshi Iinuma³, Yusaku Ohta⁴, Shunsuke Horicuhi³, Hikaru Iwamori³ (1.Department of Earth Sciences, Tohoku University, 2.Earth Observatory of Singapore, Nanyang Technological University, 3.Japan Agency for Marine-Earth Science and Technology, 4.Department of Geophysics, Tohoku University)

Session information