[S-IT25] [EE] New constraints on the asthenosphere and its role in plate tectonics

2017年5月20日(土) 15:30 〜 17:00 ポスター会場 (国際展示場 7ホール)

コンビーナ:William Bythewood Hawley(University of California Berkeley)、川勝均(東京大学地震研究所)、日置幸介(北海道大学大学院理学研究院地球惑星科学部門)、Thorsten W Becker(Jackson School of Goesciences, The University of Texas at Austin)

The Earth's asthenosphere represents a critical region that can control the influence tectonic plates and other surficial processes have on the Earth's deeper mantle, and vice versa. The composition of the Earth's tectonic plates is largely a result of magmatism at mid-ocean ridges and arc systems, and accumulation from below (underplating), which is in turn modulated by the physics and chemistry present in the asthenosphere. Uncertainties in the forces that drive tectonic plates largely arise from incomplete descriptions of the asthenosphere's mechanical properties. Visco-elastic processes ranging from post-seismic deformation to glacial isostatic adjustment are also influenced by the asthenosphere. Recent modeling techniques and new datasets, particularly from the seafloor and subduction zones, have allowed for a better characterization of the asthenosphere. We seek contributions from any discipline from observation to theory, including seismology, geodesy, chemistry, geology, magnetotellurics, and geodynamics, that shed light on the chemistry and physics of continental or oceanic asthenosphere.

[SIT25-P01] Estimation of electrical anisotropy in the oceanic upper mantle from seafloor magnetotelluric array data

*松野哲男¹、馬場聖至²、歌田久司² (1.神戸大学海洋底探査センター、2.東京大学地震研究所)

[SIT25-P02] Layered seismic anisotropic structure of the subducting asthenosphere in the Cocos subduction zone

*Cheng-Chien Peng¹、Ban-Yuan Kuo²、Chin-Wu Chen¹ (1.Institute of Oceanography, National Taiwan University、2.Institute of Earth Sciences, Academia Sinica)

[SIT25-P03] Radial anisotropy as "bodywave-surface wave discrepancy"

*川勝均¹ (1.東京大学地震研究所)

[SIT25-P04] Constraints on mantle flow in the oceanic upper mantle from a high-resolution estimate of seismic velocities in the central Pacific

*James B Gaherty¹、Joshua B Russell¹、Peiying (Patty) Lin² (1.Lamont Doherty Earth Observatory、2.Taiwan Ocean Research Institute)

[SIT25-P05] Waveform modeling of BBOBS data for old oceanic lithosphere-asthenosphere system

*丸山純平¹、竹内希¹、川勝均¹ (1.東京大学地震研究所)

[SIT25-P06] Super-weak asthenosphere in light of plate motions and azimuthal anisotropy

*Thorsten W Becker¹ (1.Jackson School of Goesciences, The University of Texas at Austin)

[SIT25-P07] Significance of sediment reverberations on receiver functions of broadband OBS data

*安部祐希¹、川勝均² (1.神奈川県温泉地学研究所、2.東京大学地震研究所)

[SIT25-P08] The impact of temporal stress variations, dynamic disequilibrium, and asthenospheric channels on the initiation of plate tectonics

*Vlada Stamenkovic^1,2、Tobias Höink³、Adrian Lenardic³ (1.California Institute of Technology、2.Jet Propulsion Laboratory、3.Rice University)

[SIT25-P09] Diffusion creep of fine-grained olivine aggregates : Chemical and melt effects

*谷部功将¹、平賀岳彦¹ (1.東京大学地震研究所)

[SIT25-P10] Water sensitivity of the rheology and seismic properties of upper-mantle olivine

Ulrich H Faul¹、Christopher J Cline II²、Emmanuel C David^2,3、Andrew J Berry²、*Ian Jackson² (1.Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, USA、2.Research School of Earth Sciences, Australian National University, Canberra, Australia、3.Department of Earth Sciences, University College London, London, UK)

[SIT25-P11] Temperature dependency of the electrical grain boundary transport in forsterite aggregates

*末善健太¹、平賀岳彦¹ (1.東京大学地震研究所)

[SIT25-P12] Thermal & petrological structure of lithospheric mantle deciphered from xenoliths from Ichinomegata, NE Japan.

*佐藤侑人¹、小澤一仁¹ (1.東京大学大学院理学系研究科地球惑星科学専攻)

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