Hypocenter distribution of plate boundary zone off Fukushima, Japan, derived from ocean bottom seismometer data

• Shinohara Masanao

  Earthquake Research Institute, University of Tokyo

• Hino Ryota

  Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University

• Yoshizawa Takashi

  Graduate School of Science and Technology, Chiba University

• Nishino Minoru

  Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University

• Sato Toshinori

  Department of Earth Sciences, Faculty of Science, Chiba University

• Suyehiro Kiyoshi

  Japan Agency for Marine-Earth Science and Technology

抄録

Microearthquake observation using Ocean Bottom Seismometers (OBSs) was carried out to obtain a detailed distribution of microearthquakes beneath the area off Fukushima, in the middle section of the Japan Trench in the summer of 1997. The observation period spanned approximately one month. Almost all of the well-determined hypocenters occurred in the vicinity of the plate boundary in this region (approximately 100 km landward of the trench axis), while seismicity is markedly lower between this area and the trench itself. The seaward limit of the high seismicity region is close to the western end of the zone of direct contact between the oceanic crust and the overriding landward crust. Twenty-nine earthquakes were recorded within the overriding landward plate. Twelve earthquakes were recorded about 30 km below the plate boundary, and form a landward dipping plane that appears to be an up-dip continuation of the lower plane of the double seismic zone. The microseismicity characteristics of the plate boundary region are interpreted to be controlled by the geometry and physical properties of the plate interface. The seismic activity in the lower seismic plane near the trench is considered to relate to bending of the subducting plate and to dehydration of serpentinized Pacific Plate mantle.

収録刊行物

• Ｅａｒｔｈ，　Ｐｌａｎｅｔｓ　ａｎｄ　Ｓｐａｃｅ

  Ｅａｒｔｈ，　Ｐｌａｎｅｔｓ　ａｎｄ　Ｓｐａｃｅ 57 (2), 93-105, 2005

  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

• OBS
• microearthquake
• Japan Trench
• subduction
• double planed seismic zone

詳細情報

• CRID: 1390001206513764480
• NII論文ID: 10017467791
• NII論文ID: 130003956462
• NII書誌ID: AA11211921
• DOI: 10.1186/bf03352553
• ISSN: 18805981
• ISSN: 13438832
• NDL書誌ID: 7290638
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7290638
• Web Site: https://link.springer.com/content/pdf/10.1186/BF03352553.pdf
• Web Site: https://link.springer.com/article/10.1186/BF03352553/fulltext.html
• Web Site: http://link.springer.com/content/pdf/10.1186/BF03352553
• 本文言語コード: en
• データソース種別:
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  • NDL
  • Crossref
  • CiNii Articles
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