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Delamination structure imaged in the source area of the 1982 Urakawa-oki earthquake

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Title: Delamination structure imaged in the source area of the 1982 Urakawa-oki earthquake
Authors: Murai, Yoshio Browse this author →KAKEN DB
Akiyama, Satoshi Browse this author
Katsumata, Kei Browse this author
Takanami, Tetsuo Browse this author
Yamashina, Tadashi Browse this author
Watanabe, Tomoki Browse this author
Cho, Ikuo Browse this author
Tanaka, Masayuki Browse this author
Kuwano, Asako Browse this author
Wada, Naoto Browse this author
Shimamura, Hideki Browse this author
Furuya, Itsuo Browse this author
Zhao, Dapeng Browse this author
Sanda, Ryohei Browse this author
Issue Date: 14-May-2003
Publisher: American Geophysical Union
Journal Title: Geophysical Research Letters
Volume: 30
Issue: 9
Start Page: 1490
Publisher DOI: 10.1029/2002GL016459
Abstract: The Kuril arc collides with the northeast Japan arc in the southern part of Hokkaido, Japan. 3-D tomographic inversion of data from a dense network of sensitive ocean-bottom seismographs and land stations has allowed imaging of previously unseen details of the arc-arc collision structure. A low velocity body dips gently southwestward, at depths of 35 to 45 km, from east of the Hidaka Mountains to the source area of the 1982 Urakawa-oki destructive earthquake (Ms 6.8). The low velocity body is the lower half of the lower crust of the Kuril arc, which must have been delaminated by the collision. We believe that the continuing collision of the delaminated lower crust with the northeast Japan arc resulted as an episode of aseismic slow slip prior to the 1982 Urakawa-oki earthquake as well being the reason for the high seismic activity in this region.
Rights: An edited version of this paper was published by AGU / Copyright 2003, American Geophysical Union, GEOPHYSICAL RESEARCH LETTERS
Type: article (author version)
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 村井 芳夫

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