[S-CG57] Dynamics in mobile belts

Wed. May 23, 2018 10:45 AM - 12:15 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:Shigematsu Norio, Takeshita Toru

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.

+Add all to schedule

10:45 AM - 11:00 AM

[SCG57-19] Intraplate faulting, stress accumulation, and shear localization of a crust-upper mantle system with nonlinear viscoelastic rheologies

*XUELEI ZHANG¹, Takeshi Sagiya¹ (1.Graduate School of Environmental Studies, Nagoya University)

11:00 AM - 11:15 AM

[SCG57-20] Geodetic exploration of the elastic/inelastic behavior of the Earth’s crust: resolution of mechanical response using interseismic, coseismic, and postseismic deformation

*Takeshi Sagiya^1,2, Angela Meneses-Gutierrez³, Koki Kumagai² (1.Disaster Mitigation Research Center, Nagoya University, 2.Graduate School of Environmental Studies, Nagoya University, 3.Disaster Prevention Research Institute, Kyoto University)

11:15 AM - 11:30 AM

[SCG57-21] Model construction of heterogeneous fault deformation at depth: Fault rocks along the Median Tectonic Line, eastern Kii peninsula, SW Japan.

*Takuma Katori^1,2, Norio Shigematsu¹, Jun Kameda³, Ayumu Miyakawa¹, Kenta Kobayashi², Tsuyoshi Toyoshima² (1.Geological Survey of Japan, AIST, 2.Graduate School of Science & Technology, Niigata university, 3.Earth & Planetary System Science, Hokkaido University)

11:30 AM - 11:45 AM

[SCG57-22] Model construction of heterogeneous fault deformation at depth: Fault zone architecture along the Median Tectonic Line, eastern Kii peninsula, SW Japan.

*Norio Shigematsu¹, Takuma Katori^1,2, Jun Kameda³, Ayumu Miyakawa⁴ (1.Research Institute of Earthquake and Volcano Geology, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, 2.Graduate School of Science & Technology, Niigata University, 3.Hokkaido University, 4.Research Institute of Geology and Geoinformation, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology)

11:45 AM - 12:00 PM

[SCG57-23] Frictional properties of fault rocks developed along the Median Tectonic Line

Ayumi S. Okamoto¹, *Ichiko Shimizu¹, André R. Niemeijer², Christopher J. Spiers², Shun Arai³, Toru Takeshita⁴, Tadamasa Ueda¹ (1.The University of Tokyo, 2.Utrecht University, 3.Tohoku University, 4.Hokkaido University)

12:00 PM - 12:15 PM

[SCG57-24] Development of the Median Tectonic Line fault zone, Mie Prefecture, southwest Japan: Strain localization and softening

*Toru Takeshita¹, Thomas Anthony Czertowicz¹, Dong Van Bui¹, Shun Arai², Takafumi Yamamoto³, Jun-ichi Ando³, Norio Shigematsu⁴, Koichiro Fujimoto⁵ (1.Department of Natural History Sciences, Graduate School of Science, Hokkaido University, 2.Department of Earth Science, Graduate School of Science, Tohoku University, 3.Department of Earth and Planetary Systems Science, Hiroshima University, 4.Research Institute of Earthquake and Volcano Geology, Geological Society of Japan, Natural Institute of Advanced Industrial Science and Technology, 5.Tokyo Gakugei University)

Session information