[S-CG57] Structure and evolution of Japanese islands - Formation of island arc systems and earthquake cycles

Wed. May 29, 2019 10:45 AM - 12:15 PM A09 (TOKYO BAY MAKUHARI HALL)

convener:Hiroshi Sato(Earthquake Prediction Research Center, Earthquake Research Institute, The University of Tokyo), Masanao Shinohara(Earthquake Research Institute, University of Tokyo), Masahiro Ishikawa(Graduate School of Environment and Information Sciences Yokohama National University), Makoto MATSUBARA(National Research Institute for Earth Science and Disaster Resilience), Chairperson:Hiroshi Sato(Earthquake Research Institute, Tokyo University), Masahiro Ishikawa(Yokohama National University)

Subduction processes such as accretion, back-arc-spreading, and arc-arc collisions have shaped the Japanese island arc. Recent advances in seismic imaging, both passive and controlled source, have produced new images of the crust-mantle structure under Japan and surrounding regions. Through the influence of pre-existing faults and rheological structures, these crust and mantle structures are exerting strong control on active tectonic processes like seismic activity and crustal deformation in the overriding plate. We seek contributions that document and/or model the deformation of the Japanese islands over a variety of time scales from the earthquake cycle to the tectonic evolution of the Japanese island arc, and from a range of research fields including seismology, geology, geochemistry, tectonic geomorphology, and geodynamics. Multidisciplinary studies are encouraged. We also welcome contributions in numerical or analogue geodynamical modeling that explore deformation processes.

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10:45 AM - 11:00 AM

[SCG57-07] Three-dimensional seismic velocity structure beneath and around Japanese Islands including beneath the Pacific Ocean using NIED S-net data

*Makoto MATSUBARA¹, Hiroshi Sato², Kenji Uehira¹, Masashi Mochizuki⁴, Toshihiko Kanazawa⁵, Narumi Takahashi¹, Kensuke Suzuki³, Shinichiro Kamiya¹ (1.National Research Institute for Earth Science and Disaster Resilience, 2.Earthquake Research Institute, the University of Tokyo, 3.Japan Agency for Marine-Earth Science and Technology, 4.Ministry of Education, Culture, Sports, Science and Technology, Japan , 5.Association for the Development of Earthquake Prediction)

11:00 AM - 11:15 AM

[SCG57-08] Spatio-temporal extent of Cretaceous fore-arc basin in Japan

*Yukio Isozaki¹, Ryo Hasegawa¹, Yukiyasu Tsutsumi¹ (1.Department of Earth Science and Astronomy, Multi-disciplinary Sciences - General Systems Studies, Graduate School of Arts and Sciences, The University of Tokyo)

11:15 AM - 11:30 AM

[SCG57-09] Geotectonic identities of dismembered ancient fore-arc clastics: U-Pb dating of detrital zircons in Cretaceous-Paleogene shallow marine/fluvial sandstones sporadically found in Kanto, central Japan

*Ryo Hasegawa¹, Yukio Isozaki¹, Yukiyasu Tsutsumi² (1.Department of Earth Science and Astronomy, The University of Tokyo, 2.Department of Geology and Paleontology, National Museum of Nature and Science)

11:30 AM - 11:45 AM

[SCG57-10] Laboratory Measurements of Vp, Vs and Vp/Vs for polycrystalline labradorite up to 800°C and 1GPa

*Satoko Honda¹, Masahiro Ishikawa¹ (1.Graduate School of Environment and Information Sciences, Yokohama National University)

11:45 AM - 12:00 PM

[SCG57-11] Shallow to deeper structures of the Median Tectonic Line active fault system in Shikoku illuminated by new hi-resolution seismic reflection profiling, southwest Japan

*Tatsuya Ishiyama¹, Naoko Kato¹, Shin Koshiya², Hiroshi Sato¹, Makoto MATSUBARA³, Tomoko Elizabeth Yano³, Taro Koike⁴, Katsuya Noda⁴ (1.Earthquake Research Institute, University of Tokyo, 2.Department of Civil and Environmental Engineering, Faculty of Science and Engineering, Iwate University, 3.National Research Institute for Earth Science and Disaster Resilience, 4.Geosys, Inc. )

12:00 PM - 12:15 PM

[SCG57-12] Cenozoic evolution of the Tsushima Strait and the Fukue Basin, southern Sea of Japan: an interplay of tectonics, palaeo-environment, and volcanism

*Johan S. Claringbould¹, Hiroshi Sato¹, Tatsuya Ishiyama¹, Anne Van Horne^1,2, Shinji Kawasaki³, Susume Abe⁴ (1.Earthquake Research Institute, The University of Tokyo, 2.Department of Geology and Geophysics, University of Wyoming, 3.JGI, Inc., 4.JAPEX)

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