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A low velocity zone beneath the Hida Mountains derived from dense array observation and tomographic method

Earth, Planets and Space volume 52, pages 143–154 (2000)Cite this article

Abstract

Seismic waves suffer strong attenuation when propagating beneath the Hida Mountains in Central Honshu, Japan. In order to study this region in detail, we conducted three kinds of dense seismic array observations in and around the Hida Mountains in the summer of 1996. Picking P- and S-wave arrival time data from 54 events at 101 stations, 3175 P- and 2335 S-wave arrival time data were obtained for our tomographic study. Hypocenter locations and velocity structure were determined simultaneously. We assessed ray coverage and resolution of the velocity structure with checkerboard resolution tests. Ray paths for the model of the obtained velocity structure were examined in detail. There are two zones of low P-wave velocity, one at a depth of 4 km and the other at 15 km. The resolution is good at depths of 0–20 km for P-wave velocities and at depths of 0–15 km for S-wave velocities. A high VP/VS ratio (2.7) indicates that a partially melting rock exists beneath the Hida Mountains. The deep low velocity zone is located just above the upper/lower crustal boundary. These observations indicate that a magma reservoir exists in the upper crust beneath the Hida Mountains.

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Authors and Affiliations

  1. The Earthquake Research Institute, the University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-0032, Japan

    Makoto Matsubara, Naoshi Hirata & Shin’ichi Sakai

  2. Toyama University, 3190 Gofuku, Toyama, 930-8555, Japan

    Ichiro Kawasaki

Authors
  1. Makoto Matsubara
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  2. Naoshi Hirata
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  3. Shin’ichi Sakai
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  4. Ichiro Kawasaki
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Correspondence to Makoto Matsubara.

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Matsubara, M., Hirata, N., Sakai, S. et al. A low velocity zone beneath the Hida Mountains derived from dense array observation and tomographic method. Earth Planet Sp 52, 143–154 (2000). https://doi.org/10.1186/BF03351623

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  • DOI: https://doi.org/10.1186/BF03351623

Keywords

  • Velocity Structure
  • Grid Node
  • Velocity Zone
  • Earthquake Research Institute
  • Travel Time Inversion