固体地球科学(S)
セッション小記号地球内部科学・地球惑星テクトニクス(IT)
セッションIDS-IT24
タイトル和文Attenuation from crust to core: in situ experiments, observaions and implications
英文Attenuation from crust to core: in situ experiments, observaions and implications
タイトル短縮名和文Attenuation from crust to core: in situ experiments, observaions and implications
英文Attenuation from crust to core
代表コンビーナ 氏名和文小西 健介
英文Konishi Kensuke
所属和文台湾中央研究院地球科学研究所
英文Institute of Earth Sciences, Academia Sinica
共同コンビーナ 1氏名和文片山 郁夫
英文Ikuo Katayama
所属和文広島大学大学院理学研究科地球惑星システム学専攻
英文Department of Earth and Planetary Systems Science, Hiroshima University
共同コンビーナ 2氏名和文芳野 極
英文Takashi Yoshino
所属和文岡山大学惑星物質研究所
英文Institute for Planetary Materials, Okayama University
共同コンビーナ 3氏名和文Alexandre Schubnel
英文Alexandre Schubnel
所属和文CNRS
英文CNRS
発表言語E
スコープ和文Most tomographic studies have been focused upon drawing maps of seismic velocity (SV) structures based on seismic data, with the ultimate goal of learning more about the structure and the composition of the mantle. Another key physical property that is accessible from seismic data is seismic attenuation (SA). Due to complications in isolating its intrinsic causes - e.g. local physical changes - and its extrinsic contributions - mainly scattering and other wave-propagation effects - SA has been underutilized. Yet, advances in waveform inversion have in association with recent enhancements of data permitted for a finer, more comprehensive determination of SA, opening the way to structural interpretations.
Difficulties in classifying and modelling the possible causes of intrinsic SA - e.g. temperature, melt, volatiles, and grain size - have also been raised. Increasingly, theoretical and experimental mineral physics have come to document the relationship between the behavior of SA and an assortment of other phenomena - most particularly, partial melt. These results can subsequently be used interpret seismological observations.
Seismic attenuation is critically implicated in structure, composition, and in fine mantle dynamics at the local, regional, and global scales. It may be used to constrain the existence of water in the transition zone; the presence of melt in various regions - for instance around subduction zones; and in the temperature field of the deep mantle - which would, in turn, help to resolve the chemical contribution to SV observed in this region.
In this session, we would like to discuss aspects of mantle attenuation, with the aim of sharing the current state of all relevant fields of study. We welcome contributions from different fields - in particular, from seismology, mineral physics, and geodynamics, as these may advance our mutual comprehension of SA and its implications; and lay the groundwork for future research and applications thereof.
英文Most tomographic studies have been focused upon drawing maps of seismic velocity (SV) structures based on seismic data, with the ultimate goal of learning more about the structure and the composition of the mantle. Another key physical property that is accessible from seismic data is seismic attenuation (SA). Due to complications in isolating its intrinsic causes - e.g. local physical changes - and its extrinsic contributions - mainly scattering and other wave-propagation effects - SA has been underutilized. Yet, advances in waveform inversion have in association with recent enhancements of data permitted for a finer, more comprehensive determination of SA, opening the way to structural interpretations.
Difficulties in classifying and modelling the possible causes of intrinsic SA - e.g. temperature, melt, volatiles, and grain size - have also been raised. Increasingly, theoretical and experimental mineral physics have come to document the relationship between the behavior of SA and an assortment of other phenomena - most particularly, partial melt. These results can subsequently be used interpret seismological observations.
Seismic attenuation is critically implicated in structure, composition, and in fine mantle dynamics at the local, regional, and global scales. It may be used to constrain the existence of water in the transition zone; the presence of melt in various regions - for instance around subduction zones; and in the temperature field of the deep mantle - which would, in turn, help to resolve the chemical contribution to SV observed in this region.
In this session, we would like to discuss aspects of mantle attenuation, with the aim of sharing the current state of all relevant fields of study. We welcome contributions from different fields - in particular, from seismology, mineral physics, and geodynamics, as these may advance our mutual comprehension of SA and its implications; and lay the groundwork for future research and applications thereof.
発表方法口頭および（または）ポスターセッション
招待講演Jerome Fortin (Ecole Normale Superieure - Paris)
武井 康子 (東京大学地震研究所)
竹内 希 (東京大学地震研究所)
時間講演番号タイトル発表者予稿原稿
口頭発表 5月26日 AM1
09:00 - 09:15SIT24-01Anomalous Vp/Vs Ratios at Seismic Frequencies Might Evidence Highly Damaged Rocks in Subduction ZonesAlexandre Schubnel予稿
09:15 - 09:30SIT24-02Imaging crustal seismic attenuation, central Taupo Volcanic Zone, New ZealandStephen C Bannister予稿
09:30 - 09:45SIT24-03海洋アセノスフェア地震学的構造に対する新たな制約竹内 希予稿
09:45 - 10:00SIT24-04Frequency effects on elastic properties of saturated porous rocks: Experimental investigationsJerome Fortin予稿
10:00 - 10:15SIT24-05Rock anelasticity due to grain boundary premelting武井 康子予稿
10:15 - 10:30SIT24-06Experimental study of the effects of partial melting on anelasticity: toward quantitative interpretations of seismic high attenuation山内 初希予稿
講演番号タイトル発表者予稿原稿
ポスター発表 5月26日 PM2
SIT24-P01水に飽和した花崗岩の三軸試験中での地震波減衰の測定片山 郁夫予稿
SIT24-P02Waveform inversion for the radial elastic and anelastic structure of the lowermost mantle beneath Central America and the CaribbeanBorgeaud Anselme予稿
SIT24-P033-D elastic and anelastic structure of the lowermost mantle beneath the western Pacific from finite-frequency tomography小西 健介予稿
SIT24-P04Inferring the lowermost mantle thermo-chemical structure beneath the Western Pacific with seismic attenuation and shear-wave speed anomaliesFrederic Deschamps予稿
SIT24-P05Intrinsic attenuation factor Q of partially molten Fe–S–O systemChao Liu予稿
SIT24-P06サーマルクラックの入った花崗岩における間隙水圧の弾性波減衰への影響山田 恵也予稿