Seismological and geological characterization of the crust in the southern part of northern Fossa Magna, central Japan

• Sato Hiroshi

  Earthquake Research Institute, University of Tokyo

• Iwasaki Takaya

  Earthquake Research Institute, University of Tokyo

• Ikeda Yasutaka

  Department of Earth and Planetary Science

• Takeda Tetsuya

  Earthquake Research Institute, University of Tokyo

• Matsuta Nobuhisa

  Earthquake Research Institute, University of Tokyo

• Imai Tomoko

  Earthquake Research Institute, University of Tokyo

• Kurashimo Eiji

  Earthquake Research Institute, University of Tokyo

• Hirata Naoshi

  Earthquake Research Institute, University of Tokyo

• Sakai Sin'ichi

  Earthquake Research Institute, University of Tokyo

• Elouai Driss

  Department of Earth and Planetary Systems Science, Hiroshima University

• Kawanaka Taku

  JGI Inc.

• Kawasaki Shinji

  JGI Inc.

• Abe Susumu

  JGI Inc.

• Kozawa Takeshi

  JGI Inc.

• Ikawa Takeshi

  JGI Inc.

• Arai Yoshimasa

  Tokyo Electric Power Company

• Kato Naoko

  Earthquake Research Institute, University of Tokyo

Abstract

The northern Fossa Magna (NMF) is a Miocene rift basin formed in the final stages of the opening of the Sea of Japan. The northern part of Itoigawa-Shizuoka Tectonic Line (ISTL) bounds the western part of the NMF and forms an active fault system that displays one of the largest slip rates in the Japanese islands. Reflection and refraction/wide-angle reflection profiling and earthquake observations by a dense array were undertaken across the northern part of ISTL in order to delineate structures in the crust, and deep geometry of the active fault systems. The ISTL active fault system at depth (ca. 2 km) shows east-dipping low-angle in Omachi and Matsumoto and is extended beneath the Central Uplift Zone and Komoro basin keeping the same dip-angle down to ca. 15 km. The upper part of the crust beneath the Central Uplift Zone is marked by the high Vp and high resistivity zone. Beneath the folded zone of the NMF, the middle to lower crust shows low Vp, low resistivity and more reflective features. The balanced geologic cross-section based on the reflection profiles suggests that the shortening deformation since the late Neogene was produced by the basin inversion of the Miocene low-angle normal fault.

Journal

• Earth, Planets and Space

  Earth, Planets and Space 56 (12), 1253-1259, 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

• Crustal structure
• geologic structure
• active fault
• Itoigawa-Shizuoka tectonic line
• northern Fossa Magna
• seismic reflection profile
• seismic refraction profile
• central Japan

Details

• CRID: 1390282681489285248
• NII Article ID: 10017467138
• NII Article ID: 130003781018
• NII Book ID: AA11211921
• DOI: 10.1186/bf03353348
• ISSN: 18805981
• ISSN: 13438832
• NDL BIB ID: 7279571
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7279571
• Web Site: https://link.springer.com/content/pdf/10.1186/BF03353348.pdf
• Web Site: https://link.springer.com/article/10.1186/BF03353348/fulltext.html
• Web Site: http://link.springer.com/content/pdf/10.1186/BF03353348
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed