Repeating earthquakes and quasi-static slip on the plate boundary east off northern Honshu, Japan

• Matsuzawa Toru

  Graduate School of Science, Tohoku University

• Uchida Naoki

  Graduate School of Science, Tohoku University

• Igarashi Toshihiro

  Earthquake Research Institute, University of Tokyo

• Okada Tomomi

  Graduate School of Science, Tohoku University

• Hasegawa Akira

  Graduate School of Science, Tohoku University

抄録

We have investigated spatio-temporal variation in small repeating earthquake activity in the 1989 earthquake swarm and used them to infer quasi-static slip distribution on the plate boundary off Sanriku, northern Honshu, Japan. Seismicity and inferred quasi-static slip accelerations propagated to the west and to the south during the swarm activity to trigger the occurrence of the largest earthquake (M7.1). To explain the migration of the seismicity and inferred quasi-static slip acceleration, we propose a conceptual model named the ‘chain reaction model’ in which large earthquakes generate large afterslips and then the afterslips accelerate the ruptures of the nearby asperities to generate the next earthquakes which are also followed by large afterslips, and so on. The model is applicable to a plate boundary where asperities are located sparsely but the afterslip associated with the rupture of an asperity can reach nearby asperities. Aftershock area expansion, which is conspicuous off Sanriku, is also explained by the model. If we can evaluate the slip deficit of a large asperity correctly, we will be able to issue a warning of large earthquake occurrence in some areas when we detect the acceleration of quasi-static slip near the asperity although the prediction is inevitably probabilistic.

収録刊行物

• Ｅａｒｔｈ，　Ｐｌａｎｅｔｓ　ａｎｄ　Ｓｐａｃｅ

  Ｅａｒｔｈ，　Ｐｌａｎｅｔｓ　ａｎｄ　Ｓｐａｃｅ 56 (8), 803-811, 2004

  地球電磁気・地球惑星圏学会 、公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会

キーワード

• Space and Planetary Science
• Geology

詳細情報

• CRID: 1390001206513467136
• NII論文ID: 10017465365
• NII書誌ID: AA11211921
• DOI: 10.1186/bf03353087
• ISSN: 18805981
• ISSN: 13438832
• ISSN: http://id.crossref.org/issn/13438832
• NDL書誌ID: 7079283
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7079283
• Web Site: https://link.springer.com/content/pdf/10.1186/BF03353087.pdf
• Web Site: https://link.springer.com/article/10.1186/BF03353087/fulltext.html
• Web Site: http://link.springer.com/content/pdf/10.1186/BF03353087
• 本文言語コード: en
• データソース種別:
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  • NDL
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