[E] Oral

S (Solid Earth Sciences ) » S-IT Science of the Earth's Interior & Techtonophysics

[S-IT27] Oceanic lithosphere and asthenosphere

convener:Nozomu Takeuchi(Earthquake Research Institute, University of Tokyo), Ban-Yuan Kuo(Institute of Earth Sciences, Academia Sinica), Rob L Evans(Woods Hole Oceanographic Institution), Younghee Kim(Seoul National University)

The oceanic lithosphere/asthenosphere system (LAS) is one of the most fundamental features of plate tectonics. In recent years, the elucidation of the oceanic lithosphere/asthenosphere system has become one of the hot topics in solid earth science. New data from the ocean floor are being extensively obtained under the Pacific Array initiative (http://eri-ndc.eri.u-tokyo.ac.jp/PacificArray/) and others, and a great variety of views are proposed and discussed. In this session, we will discuss on observation technologies, views of the oceanic lithosphere/asthenosphere system, the strategies for interpretation of the observations (including seismic and/or electrical conductivity anisotropy), constraints/ideas on the role and abundance of water/melt in the mantle (including the transition zone), and other related topics for elucidating this enigmatic system. We call for contributions from diverse fields, including but not limited to seismology, magnetotellurics, petrology/mineralogy, dynamical modelling, and mineral physics.

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[SIT27-01] Pacific Array update 2020

*Hitoshi Kawakatsu¹, - the international Pacific Array team (1.Earthquake Research Institute, The University of Tokyo)

[SIT27-02] Olivine fabric development during Newtonian (diffusion creep) corner flow.

*NAHYEON KIM¹, Takehiko Hiraga¹ (1.Earthquake Research Institute, University of Tokyo)

[SIT27-03] The seismic structure of the oldest Pacific: Preliminary results from the broadband Rayleigh-wave dispersion analysis of the Pacific Array, Oldest-1

*Yuki Kawano¹, Takehi Isse¹, Akiko Takeo¹, Hitoshi Kawakatsu¹, Hajime Shiobara¹, Nozomu Takeuchi¹, Hiroko Sugioka², YoungHee Kim³, Hisashi Utada¹, Sang-Mook Lee³ (1.Earthquake Research Institute, The University of Tokyo, 2.Kobe University, 3.Seoul National University)

Cancelled

[SIT27-04] Surface wave imaging of the lithosphere and asthenosphere system beneath north part of Okinawa Trough from NOT OBS array

*PeiYing Patty Lin¹, Hsiu-Cheng Yeh¹, Chih-Ming Lin¹, Ban-Yuan Kuo², Shu-Huei Hung³, Yuancheng Gung³, Eh Tan², Kate Huihsuan Kate Chen¹, Ching-Ren Lin², Chau-Chang Wang^4,5, Shuichi Kodaira⁶, Yasushi Ishihara⁶, Mamoru Nakamura⁷ (1.National Taiwan Normal University, Taipei, Taiwan, 2.Academia Sinica, Taipei, Taiwan, 3.National Taiwan University, Taipei, Taiwan, 4.Taiwan Ocean Research Institute, National Applied Research Laboratories, Kaohsiung, Taiwan , 5.National Sun Yat-sen University, Kaohsiung, Taiwan, 6.Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan, 7.University of the Ryukyus, Okinawa, Japan)

[SIT27-05] A peridotite xenolith from garnet-stability field beneath Aitutaki (Cook islands): an implication for small-scale convection

*Norikatsu Akizawa¹, Kazuhito Ozawa², Simon Richard Wallis², Akihiro Tamura³, Akira Ishikawa⁴, Tetsu Kogiso⁵ (1.Atmosphere and Ocean Research Institute, The University of Tokyo, 2.Department of Earth and Planetary Science, The University of Tokyo, 3.Faculty of Geosciences and Civil Engineering, Kanazawa University, 4.Department of Earth and Planetary Sciences, Tokyo Institute and Technology, 5.Graduate School of Human and Environmental Studies, Kyoto University)

[SIT27-06] Three dimensional shear wave structure in the upper mantle beneath the oldest Pacific plate

*Takehi Isse¹, Hitoshi Kawakatsu¹, Hajime Shiobara¹, Nozomu Takeuchi¹, Hiroko Sugioka², Younghee Kim³, Hisashi Utada¹, Sang-Mook Lee³, Kazunori Yoshizawa⁴ (1.Earthquake Research Institute, the University of Tokyo, 2.Department of Planetology, Kobe University, 3.Seoul National University, 4.Faculty of Science, Hokkaido University)