Seismic reflection profiling across the Itoigawa-Shizuoka Tectonic Line at Matsumoto, Central Japan
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- Ikeda Yasutaka
- Department of Earth and Planetary Science, University of Tokyo
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- Iwasaki Takaya
- Earthquake Research Institute, University of Tokyo
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- Sato Hiroshi
- Earthquake Research Institute, University of Tokyo
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- Matsuta Nobuhisa
- Earthquake Research Institute, University of Tokyo
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- Kozawa Takeshi
- JGI Inc.
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The Itoigawa-Shizuoka Tectonic Line (ISTL) in Central Japan is a fault zone with a very high slip rate during Pliocene-Quaternary time. Our seismic reflection and gravity surveys across the northern segment of the ISTL at Matsumoto have revealed its geometry to a depth of -5 km. The fault plane was found to be of fairly low angle, in spite of the surface geologic observations that late Quaternary movements on this fault zone are dominantly strike slip. Partitioning of slip is taking place between the East Boundary Fault (thrust) and the Gofukuji Fault (left-slip), which constitute the fault zone and are parallel to and a few km apart from each other. However, these two faults are found to merge down-dip at a depth as shallow as 1.5 km below the surface. The geometry of the ISTL is significantly discordant with the orientation of the maximum shear stress acting regionally on Central Japan, indicating that the fault plane is of very low strength.
収録刊行物
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- Ｅａｒｔｈ， Ｐｌａｎｅｔｓ ａｎｄ Ｓｐａｃｅ
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Ｅａｒｔｈ， Ｐｌａｎｅｔｓ ａｎｄ Ｓｐａｃｅ 56 (12), 1315-1321, 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
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詳細情報 詳細情報について
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- CRID
- 1390001206512577664
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- NII論文ID
- 10017467339
- 130003781021
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- NII書誌ID
- AA11211921
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- ISSN
- 18805981
- 13438832
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- NDL書誌ID
- 7279607
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- 使用不可
