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

Yoshio Murai, Satoshi Akiyama, Kei Katsumata, Tetsuo Takanami, Tadashi Yamashina, Tomoki Watanabe, Ikuo Cho, Masayuki Tanaka, Asako Kuwano, Naoto Wada, Hideki Shimamura, Itsuo Furuya, Dapeng Zhao, Ryohei Sanda

doi:10.1029/2002gl016459

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

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Yoshio Murai

Institute of Seismology and Volcanology, Graduate School of Science Hokkaido University Sapporo Japan
Satoshi Akiyama

Institute of Seismology and Volcanology, Graduate School of Science Hokkaido University Sapporo Japan
Kei Katsumata

Institute of Seismology and Volcanology, Graduate School of Science Hokkaido University Sapporo Japan
Tetsuo Takanami

Institute of Seismology and Volcanology, Graduate School of Science Hokkaido University Sapporo Japan
Tadashi Yamashina

Institute of Seismology and Volcanology, Graduate School of Science Hokkaido University Sapporo Japan
Tomoki Watanabe

Institute of Seismology and Volcanology, Graduate School of Science Hokkaido University Sapporo Japan
Ikuo Cho

Institute of Seismology and Volcanology, Graduate School of Science Hokkaido University Sapporo Japan
Masayuki Tanaka

Seismological and Volcanological Department Japan Meteorological Agency Tokyo Japan
Asako Kuwano

Institute of Seismology and Volcanology, Graduate School of Science Hokkaido University Sapporo Japan
Naoto Wada

Institute of Seismology and Volcanology, Graduate School of Science Hokkaido University Sapporo Japan
Hideki Shimamura

Institute of Seismology and Volcanology, Graduate School of Science Hokkaido University Sapporo Japan
Itsuo Furuya

Seismological and Volcanological Department Japan Meteorological Agency Tokyo Japan
Dapeng Zhao

Geodynamics Research Center Ehime University Matsuyama Japan
Ryohei Sanda

Geodynamics Research Center Ehime University Matsuyama Japan

書誌事項

公開日: 2003-05

権利情報

http://onlinelibrary.wiley.com/termsAndConditions#vor

DOI

10.1029/2002gl016459

公開者: American Geophysical Union (AGU)

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説明

<jats:p>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 (<jats:italic>Ms</jats:italic> 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.</jats:p>