[S-CG66] [EE] Shallow and intermediate depth intraslab earthquakes: seismogenesis and rheology of the slab

Tue. May 23, 2017 3:30 PM - 5:00 PM Poster Hall (International Exhibition Hall HALL7)

convener:Tomohiro Ohuchi(Geodynamics Research Center, Ehime University), Saeko Kita(Department of Earth and Planetary Systems Science, Hiroshima University), Brent G Delbridge(Berkeley Seismological Lab), Ikuo Katayama(Department of Earth and Planetary Systems Science, Hiroshima University)

The rheological behavior of subducting slabs contributes to the generation and occurrence of intraslab earthquakes; however, we currently lack an understanding of the physical mechanisms linking these properties to the generation of intraslab earthquakes. The purpose of this session is to share constraints and advances in the understanding of the mechanisms that generate shallow and intermediate depth earthquakes, including both brittle and ductile flow rheologies. We seek to formulate future directions of the interdisciplinary study of the occurrence of intraslab earthquakes from the viewpoint of seismology, geodynamics and mineral physics. We welcome presentations from a wide variety of scientific disciplines, including observational and theoretical seismology, seismotectonics, geodynamics, mineral and rock physics, geology, and numerical modeling. Studies related to the thermal and tectonic structures of the subducting slab are also welcomed.

[SCG66-P01] Characteristics of the stress drops for intralslab earthquakes beneath Tohoku and Hokkaido, northeastern Japan

*Saeko Kita¹, Takahiro Shiina² (1.School of science, Hiroshima University, 2.Institute of seismology and volcanology, school of science, Hokkaido Univerisity)

[SCG66-P02] Mechanisms and distribution of deep Earthquakes in the subducting Pacific slab beneath Japan

*Ayako Tsuchiyama¹, Junichi Nakajima¹, Toru Matsuzawa² (1.Tokyo Institute of Technology, 2.Tohoku University)

[SCG66-P03] Relation of seismicity with age in stable oceanic plates and its implication for the mechanism of intraplate earthquakes

*Kazuya Ueyama¹, Yukitoshi Fukahata¹ (1.Disaster Prevention Research Institute, Kyoto University)

[SCG66-P04] The depth variations in seismic velocity and intermediate-depth seismicity in the subducting crust of the Pacific slab

*Takahiro Shiina¹, Junichi Nakajima², Toru Matsuzawa³, Genti Toyokuni³, Saeko Kita⁴ (1.Institute of Seismology and Volcanology, Graduate School of Science, Hokkaido University, 2.Graduate School of Science and Engineering, Tokyo Institute of Technology, 3.Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University, 4.Graduate School of Science, Hiroshima University)

[SCG66-P05] Experimental investigation of dehydration weakening and embrittlement of antigorite serpentinite and possible mechanisms to induce various fault slip behaviors in subduction zones

*Keishi Okazaki^1,2, Greg Hirth², Ikuo Katayama³ (1.Japan Agency for Marine-Earth Science and Technology, 2.Brown University, 3.Hiroshima University)

[SCG66-P06] Shear localization in peridotites and the occurrence of intermediate-depth earthquakes

*Tomohiro Ohuchi¹, Xinglin Lei², Hiroaki Ohfuji¹, Yuji Higo³, Yoshinori Tange³, Takeshi Sakai¹, Kiyoshi Fujino¹, Tetsuo Irifune^1,4 (1.Geodynamics Research Center, Ehime University, 2.National Institute of Advanced Industrial Science and Technology, 3.Japan Synchrotron Radiation Research Institute, 4.Earth-Life Science Institute, Tokyo Institute of Technology)

[SCG66-P07] Study of deformation mechanism(s) of sandstones by parallel AE signal measurement and neutron diffraction technique

*Jun Abe¹, Kotaro Sekine², Harjo Stefanus³, Takuro Kawasaki³, Kazuya Aizawa³ (1.Comprehensive Research Organization for Science and Society, 2.Japan Oil, Gas and Metal National Corporation, 3.Japan Atomic Energy Agency)

[SCG66-P08] Shear deformation experiments of two-phase aggregates of antigorite and olivine at high pressure: A preliminary study

*Mai Ikehara¹, Tomoaki Kubo¹ (1.Department of Earth and Planetary Sciences, Faculty of Science, Kyushu University)

Session information