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

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概要

• 論文の詳細を見る

• 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.

• American Geophysical Unionの論文
• 2003-05-14

著者

• 塩原 肇

  東京大学地震研究所

• 塩原 肇

  東大 地震研

• Kato Aitaro

  Univ. Tokyo Tokyo Jpn

• Takeda Tetsuya

  National Res. Inst. Earth Sci. And Disaster Prevention Ibaraki Jpn

• WATANABE Tomoki

  Japan Marine Science and Technology Center

• MURAI Yoshio

  Institute of Seismology and Volcanology, Hokkaido University

• Shimamura Hideki

  Inst. For Seismology And Volcanology Hokkaido University

• Kuwano Asako

  Univ. Tokyo Tokyo Jpn

• Murai Yoshio

  Hokkaido Univ. Sapporo Jpn

• Machida Yuya

  Institute Of Seismology And Volcanology Hokkaido University

• Takanami T

  Institute Of Seismology And Volcanology Hokkaido University

• Machida Yuya

  Earthquake Research Institute University Of Tokyo

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