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

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.

References

  • Campillo, M., B. Feignier, M. Bouchon, and N. Bethoux, Attenuation of crustal waves across the Alpine range, J. Geophys. Res., 98, 1987–1996, 1993.

    Article  Google Scholar 

  • Červený, V. and I. Psencik, Program package SEIS83, Charles Univ., Prague., 1983.

    Google Scholar 

  • Fukao, Y. and K. Yamaoka, Stress estimate for the highest mountain system in Japan, Tectonics, 2(5), 453–471, 1983.

    Article  Google Scholar 

  • GROUPS96, The 1996 Joint Geophysical Research in the Hida district, Prog. Abs. seismo. Soc. Japan, 1996 (in Japanese).

  • Hirahara, K., A. Ikami, M. Ishida, and T. Mikumo, Three-dimensional P-wave velocity structure beneath Central Japan: low-velocity bodies in the wedge portion of the upper mantle above high-velocity subducting plates, Tectonophys., 163, 63–73. 1989.

    Article  Google Scholar 

  • Hirata, N. and M. Matsu’ura, Maximum-likelihood estimation of hypocenter with origin time eliminated using nonlinear inversion technique, Phys. Earth Planet. Inter, 47, 50–61, 1987.

    Article  Google Scholar 

  • Ikeda, Y, The fact of topographical observation about the form of the Hida Mountains, Chikyu Monthly, 18, 62–76, 1996 (in Japanese).

    Google Scholar 

  • Katsumata, K., T. Urabe, and M. Mizoue, Evidence for a seismic attenuation anomaly beneath the Hida Mountain Range, Central Honshu, Japan, Geophys. J. Int., 120, 237–246, 1995.

    Article  Google Scholar 

  • Kimura, J. and T. Yoshida, Magma plumbing system beneath Ontake Volcano, central Japan, The Island Arc, 8, 1–29, 1999.

    Article  Google Scholar 

  • Mikumo, T, K. Hirahara, F. Takeuchi, H. Wada, T. Tsukuda, I. Fujii, and K. Nishigami, Three-dimensional velocity structure of the upper crust in the Hida Region, Central Honshu, Japan, and its relation to local seismicity, quaternary active volcanoes and faults, J. Phys. Earth, 43, 59–78, 1995.

    Article  Google Scholar 

  • Research Group for Explosion Seismology, Seismic refraction experiment in the Central Japan; Agatsuma-Kanazawa profile, Bull. Earthq. Res. Inst., 69, 139–158, 1994 (in Japanese with English abstract).

    Google Scholar 

  • Ruzankin, A. I., I. L. Nersesov, and V. I. Khalturin, Propagation of Lg and lateral variations in crustal structure in Asia, J. Geophys. Res., 82, 307–316, 1977.

    Article  Google Scholar 

  • Sakai, S., T. Iwasaki, T. Iidaka, T. Yoshii, F. Yamazaki, and T. Kuwayama, The structure of the crust of Chubu region from the explosion observation, Chikyu Monthly, 18, 104–108, 1996 (in Japanese).

    Google Scholar 

  • Shinohara, M., N. Hirata, and S. Matsuda, Long-term low-power DAT seismic digital data recorder with GPS clock, Zisin, 50, 119–124, 1997 (in Japanese with English abstract).

    Google Scholar 

  • Takeda, T, Reanalysis for seismic refraction data in Nagano Basin Area, Japan—crustal structure in Central Japan—, Master Thesis, Tokyo University, 1997 (in Japanese).

  • Urabe, T, A common format for multi-channel earthquake waveform data, Prog. Abs. seismo. Soc. Japan, 2, 384, 1994 (in Japanese).

    Google Scholar 

  • Watanabe T., Melt beneath volcanoes—Inference from seismic velocities—, Mem. Geol. Soc. Japan, 43, 20–31, 1994 (in Japanese with English abstract).

    Google Scholar 

  • Wessel, P. and W. H. F. Smith, Free software helps map and display data, Eos Trans. AGU, 72, 441, 445–446, 1991.

    Article  Google Scholar 

  • Zhao, D. and A. Hasegawa, P wave tomographic imaging of the crust and upper mantle beneath the Japan islands, J. Geophys. Res., 98, 4533–4353, 1993.

    Google Scholar 

  • Zhao, D., A. Hasegawa, and S. Horiuchi, Tomographic imaging of P and S wave velocity structure beneath Northeastern Japan, J. Geophys. Res., 97, 19909–19928, 1992.

    Article  Google Scholar 

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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

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