Seismic reflection profiling across the Itoigawa-Shizuoka Tectonic Line at Matsumoto, Central Japan

• Ikeda Yasutaka

  Department of Earth and Planetary Science, University of Tokyo

• Iwasaki Takaya

  Earthquake Research Institute, University of Tokyo

• Sato Hiroshi

  Earthquake Research Institute, University of Tokyo

• Matsuta Nobuhisa

  Earthquake Research Institute, University of Tokyo

• Kozawa Takeshi

  JGI Inc.

Abstract

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.

Journal

• Earth, Planets and Space

  Earth, Planets and Space 56 (12), 1315-1321, 2004

  Society of Geomagnetism and Earth, Planetary and Space Sciences, The Seismological Society of Japan, The Volcanological Society of Japan , The Geodetic Society of Japan , The Japanese Society for Planetary Sciences

Keywords

• Itoigawa-Shizuoka Tectonic Line
• active fault
• seismic reflection profiling
• slip partitioning
• oblique slip
• tectonic inversion

Details

• CRID: 1390001206512577664
• NII Article ID: 10017467339
• NII Article ID: 130003781021
• NII Book ID: AA11211921
• DOI: 10.1186/bf03353356
• ISSN: 18805981
• ISSN: 13438832
• NDL BIB ID: 7279607
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7279607
• Web Site: https://link.springer.com/content/pdf/10.1186/BF03353356.pdf
• Web Site: https://link.springer.com/article/10.1186/BF03353356/fulltext.html
• Web Site: http://link.springer.com/content/pdf/10.1186/BF03353356
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed