[E] Poster

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-P01] The Oldest Array: Japan-Korea Pacific Array collaboration to study the lithosphere-asthenosphere system below the oldest part of the Pacific Ocean

*Hajime Shiobara¹, Hisashi Utada¹, Seung-Sep Kim², YoungHee Kim³, Kiyoshi Baba¹, Takehi Isse¹, Hogyum Kim³, HyeJeong Kim¹, Hiroko Sugioka⁴, Nozomu Takeuchi¹, Yuki Kawano¹, Hitoshi Kawakatsu¹, Sang-Mook Lee³, Onboard scientists of 2018/2019 Oldest cruises (1.Ocean Hemisphere Research Center, Earthquake Research Institute, University of Tokyo, 2.Chungnam National University, 3.Seoul National University, 4.Kobe University)

[SIT27-P02] The Electrical Conductivity Structure of The Oldest Pacific: Preliminary Results from Magnetotelluric Observation Data of Pacific Array, Oldest-1

*Hogyum Kim¹, Kiyoshi Baba², Hisashi Utada², Sang-Mook Lee¹, Hitoshi Kawakatsu², YoungHee Kim¹ (1.School of Earth and Environmental Sciences, Seoul National University, 2.Earthquake Research Institute, The University of Tokyo)

[SIT27-P03] P Velocity Heterogeneities in the Upper Mantle beneath the Northwestern Pacific

*Nozomu Takeuchi¹, Hitoshi Kawakatsu¹, Hajime Shiobara¹, Takehi Isse¹, Hiroko Sugioka², Aki Ito³, Hisashi Utada¹ (1.Earthquake Research Institute, University of Tokyo, 2.Kobe University, 3.JAMSTEC)

[SIT27-P04] Seismic velocity structure beneath the oldest region of the Pacific ocean basin from multiscale finite-frequency traveltime tomography

*Hyunsun Kang¹, Younghee Kim¹, Shu-Huei Hung², Pei-Ying Patty Lin³, Takehi Isse⁴, Hajime Shiobara⁴, Hitoshi Kawakatsu⁴, Sang-Mook Lee¹, Hisashi Utada⁴, Nozomu Takeuchi⁴ (1.Seoul National University, 2.National Taiwan University, 3.National Taiwan Normal University, 4.Earthquake Research Institute, The University of Tokyo)