セッション概要

固体地球科学(S) セッション小記号 固体地球科学複合領域・一般(CG) セッションID S-CG08 タイトル 和文 Geodynamics of off-arc volcanism and back-arc opening 英文 Geodynamics of off-arc volcanism and back-arc opening タイトル短縮名 和文 Off-arc volcanism 英文 Geodynamics of off-arc volcanism 代表コンビーナ 氏名 和文 川勝 均 英文 Hitoshi Kawakatsu 所属 和文 東京大学地震研究所 英文 Earthquake Research Institute, University of Tokyo 共同コンビーナ 1 氏名 和文 Steve Grand 英文 Steve Grand 所属 和文 University of Texas 英文 University of Texas 共同コンビーナ 2 氏名 和文 John Chen 英文 John Chen 所属 和文 Peking Universtiy 英文 Peking Universtiy 共同コンビーナ 3 氏名 和文 Thorsten W. Becker 英文 Thorsten W. Becker 所属 和文 University of Southern California 英文 University of Southern California 国際セッション開催希望 国際セッションとしての開催を希望する 発表主要言語 英語 スコープ 和文 Deployments of large-scale, high-density seismic arrays around the world have started to reveal regional-scale, upper mantle structures with unprecedented detail. Such improved imaging is crucial to elucidating long-standing tectonic questions such as the links between surface tectonics and volcanism. For example, NECESSArray consists of 120 broadband stations deployed in northeast China (2009-2011). The region is known to display puzzling, Cenozoic intraplate and off-arc volcanism, but the relationship with the stagnant slab beneath the Japan Sea, if any, has been debated. Preliminary tomographic images from NECESSArray reveal an unexpected result; the absence of a long-tailed, stagnant slab beneath the chain of volcanoes, suggesting a possible link of volcanism either to the mantle transition zone, or the lower mantle. This finding opens a new discussion on the origin of off-arc volcanism and back-arc opening in the wider context of global geodynamics. 英文 Deployments of large-scale, high-density seismic arrays around the world have started to reveal regional-scale, upper mantle structures with unprecedented detail. Such improved imaging is crucial to elucidating long-standing tectonic questions such as the links between surface tectonics and volcanism. For example, NECESSArray consists of 120 broadband stations deployed in northeast China (2009-2011). The region is known to display puzzling, Cenozoic intraplate and off-arc volcanism, but the relationship with the stagnant slab beneath the Japan Sea, if any, has been debated. Preliminary tomographic images from NECESSArray reveal an unexpected result; the absence of a long-tailed, stagnant slab beneath the chain of volcanoes, suggesting a possible link of volcanism either to the mantle transition zone, or the lower mantle. This finding opens a new discussion on the origin of off-arc volcanism and back-arc opening in the wider context of global geodynamics. We solicit contributions from geologists, petrologists, geochemists, geophysicists, geodynamicists, and seismologists working on related problems in the NW Pacific subduction zone and other similar, or contrasting, subduction zone settings world wide. 発表方法希望 口頭および（または）ポスターセッション 招待講演 Richard M. Allen (UC Berkeley, USA) Wei Leng (U Science and Technology, Hefei, China) Tetsuya Sakuyama (IFREE/JAMSTEC) Masayuki Obayashi (IFREE/JAMSTEC)