[S-CG57] Structure, evolution and dynamics of mobile belts

Thu. May 28, 2015 11:00 AM - 12:45 PM IC (2F)

Convener:*Toru Takeshita(Department of Natural History Sciences, Graduate School of Science, Hokkaido University), Hiroshi Sato(Earthquake Prediction Research Center, Earthquake Research Institute, The University of Tokyo), Koichiro Obana(Research and Development Center for Earthquake and Tsunami, Japan Agency for Marine-Earth Science and Technology), Takuya NISHIMURA(Disaster Prevention Research Institute, Kyoto University), Yukitoshi Fukahata(Disaster Prevention Research Institute, Kyoto University), Aitaro Kato(Graduate School of Environmental Studies, Nagoya University), Jun Muto(Department of Earth Sciences, Tohoku University), Katsushi Sato(Division of Earth and Planetary Sciences, Graduate School of Science, Kyoto University), Shuichi Kodaira(Institute for Research on Earth Evolution Japan Agency for Marine-Earth Science and Technology), Takeshi Sagiya(Disaster Mitigation Research Center, Nagoya University), Tatsuya Ishiyama(Earthquake Research Institute, University of Tokyo), Makoto MATSUBARA(National Research Institute for Earth Science and Disaster Prevention), Yasutaka Ikeda(Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo), Chair:Tohru Watanabe(Gradudate School of Science and Engineering, University of Toyama)

Since the targets of dynamics in mobile belts range from orogeny and the formation of large-scale faults which occur for several hundreds to thousands years to seismic and volcanic activities which occur during a lifetime of human being, the integration of geophysics, geology and geomorphology is necessary to reveal the essence. In order to reveal dynamics in mobile belts, it is required that the temporal and spatial development of stress field due to plate movement and rheological properties must be clarified. However, not only stress in the crust has not been known, but also the rheological properties characterized by elasto-visco-plastic materials, are very complex, which depend on the time scale and stress and temperature. Further, since the properties are greatly affected by fluids and reaction via fluids, petrological and geochemical approaches are also important for the clarification. Since changes in seismic activities and large-scale crustal movement have been occurring in the whole Japanese islands due to large changes of stress and strain fields since the great Tohoku-oki earthquake, the present time is best timing to work on these researches on dynamics in mobile belts. This session welcomes presentations from observational, experimental and modeling researches of different disciplines which aim at revealing the nature of dynamics in mobile belts, such as seismology, geodesy, tectonic geomorphology, structural geology, petrology, geofluids, etc.

+Add all to schedule

11:00 AM - 11:15 AM

[SCG57-17] Construction of a dense GNSS array in the San-in shear zone

*Takuya NISHIMURA¹, Yoshinobu HOSO¹, Tsutomu MIURA¹, Itaru YONEDA¹, Toshiki KOIKE¹ (1.Disaster Prevention Research Institute, Kyoto University)

11:15 AM - 11:30 AM

[SCG57-18] Strong spatial variations of stress within the Philippines produced by slip heterogeneity along the Philippine fault

*Keisuke YOSHIDA¹, Nelson PULIDO¹, Eiichi FUKUYAMA¹ (1.National Research Institute for Earth Science and Disaster Prevention)

11:30 AM - 11:45 AM

[SCG57-19] Spatial heterogeneities of deviatoric stress in Kyushu, Japan, inferred from the focal mechanism (2)

*Satoshi MATSUMOTO¹, Takahiro OHKURA², Masahiro MIYAZAKI¹, Hiroshi SHIMIZU¹, Yuki ABE³, Hiroyuki INOUE², Manami NAKAMOTO¹, Shin YOSHIKAWA², Yusuke YAMASHITA³ (1.Institute of Seismology and Volcanology, Kyushu Univ., 2.Aso Volcanological Laboratory , Kyoto Univ., 3.Earthquake Research Institute, Univ. of Tokyo)

11:45 AM - 12:00 PM

[SCG57-20] Development of fault activity in Japan estimated from the response of the faults to the tectonic stress field

*Ayumu MIYAKAWA¹, Makoto OTSUBO² (1.Institute of Geology and Geoinformation (IGG), Geological Survey of Japan, AIST, 2.National Institute of Advanced Industrial Science and Technology (AIST), Institute of Earthquake and)

12:00 PM - 12:15 PM

[SCG57-21] Evolution of fault zone architecture during the exhumation of the Median Tectonic Line in SW Japan

*Norio SHIGEMATSU¹, Masao KAMETAKA², Noriyuki INADA², Masahiro MIYAWAKI², Tetsuhiro TOGO¹, Koichiro FUJIMOTO³ (1.Institute of Earthquake and Volcano Geology, AIST, 2.Dia Consultants Co. Ltd., 3.Tokyo Gakugei University)

12:15 PM - 12:30 PM

[SCG57-22] How do fault zones develop?: Findings from the observation of natural fault rocks

*Toru TAKESHITA¹, Yumi KANEKO¹, Shun ARAI¹ (1.Hokkaido University)

12:30 PM - 12:45 PM

[SCG57-23] Element migration via fluids with progress of fracturing along the Median Tectonic Line, Mie Prefecture, southwest Japan

*Yumi KANEKO¹, Toru TAKESHITA¹, Norio SHIGEMATSU², Koichiro FUJIMOTO³ (1.Hokkaido University Graduate school of science, 2.Active Fault and Earthquake Research Center, Geological Survey of Japan, National Institute of Advan, 3.Tokyo Gakugei University)