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

Yasutaka Ikeda, Takaya Iwasaki, Hiroshi Sato, Nobuhisa Matsuta, Takeshi Kozawa

Research output: Contribution to journalArticle

8 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)1315-1321
Number of pages7
JournalEarth, Planets and Space
Volume56
Issue number12
DOIs
Publication statusPublished - Jan 1 2004
Externally publishedYes

Keywords

  • Active fault
  • Itoigawa-Shizuoka Tectonic Line
  • Oblique slip
  • Seismic reflection profiling
  • Slip partitioning
  • Tectonic inversion

ASJC Scopus subject areas

  • Geology
  • Space and Planetary Science

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