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Volume 60 Supplement 2

Special Issue: Special Section for the 2007 Noto Hanto Earthquake (1)

Magnetotelluric observations around the focal region of the 2007 Noto Hanto Earthquake (Mj 6.9), Central Japan

Earth, Planets and Space volume 60, pages 117–122 (2008)Cite this article

Abstract

On 25 March 2007, a damaging earthquake (Mj 6.9) occurred near the west coast of the Noto Peninsula, Central Japan. A wideband magnetotelluric (MT) survey was carried out in the onshore area of the source region immediately after the mainshock, with the aim of imaging the heterogeneity of the crustal resistivity structure. The final observation network had consisted of 26 sites. As a preparatory step for imaging three-dimensional features of the resistivity around the focal region, we constructed two-dimensional resistivity models along five profiles using only the TM mode responses, in order to reduce three-dimensional effects. Four profiles are perpendicular to the fault strike, and a fifth profile is parallel to the strike through the mainshock epicenter. Significant characteristics of the resistivity models are: (1) beneath the mainshock hypocenter, there is a conductive body which spreads to the eastern edge of the active aftershock region; (2) a resistive zone is located in the gap of the aftershock distribution between the mainshock hypocenter and the largest eastern aftershock; (3) one of the largest aftershock occurred at the boundary of the resistive zone described above. These results suggest that the deep conductors represent fluid-filled zones and that the lateral heterogeneity could have controlled the slip distribution on the fault plane.

References

  • Caldwell, T. G., H. M. Bibby, and C. Brown, The magnetotelluric phase tensor, Geophys. J. Int., 158, 457–469, 2004.

    Article  Google Scholar 

  • Gamble, T. D., W. M. Goubau, and J. Clarke, Magnetotellurics with a remote magnetic reference, Geophysics, 44, 53–67, 1979.

    Article  Google Scholar 

  • Geographical Survey Institute (GSI), Crustal Movements in the Hokuriku and Chubu District, Report of The Coordinating Committee for Earthquake Prediction, 78, 424–456, 2007 (in Japanese).

    Google Scholar 

  • Ito, K., H. Wada, K. Watanabe, H. Horikawa, T. Tsukuda, and K. Sakai, 1993 off Noto Peninsula earthquake, Annuals. Disas. Prev. Res. Inst., Kyoto Univ., 37, 325–341, 1994 (in Japanese with English abstract).

    Google Scholar 

  • Japan Meteorological Agency (JMA), The Noto Hanto earthquake in 2007, Report of The Coordinating Committee for Earthquake Prediction, 78, 346–370, 2007 (in Japanese).

    Google Scholar 

  • Kato, A., S. Sakai, T. Iidaka, T. Iwasaki, E. Kurashimo, T. Igarashi, N. Hirata, T. Kanazawa, and Group for the aftershock observations of the 2007 Noto Hanto Earthquake, Three-dimensional velocity structure in the source region of the Noto Hanto Earthquake in 2007 imaged by a dense seismic observation, Earth Planets Space, 60, this issue, 105–110, 2008.

    Article  Google Scholar 

  • Lindquist, K. G., K. Engle, D. Stahlke, and E. Price, Global topography and bathymetry grid improves research efforts, Eos Trans. AGU, 85(19), 186, 2004.

    Article  Google Scholar 

  • Mitsuhata, Y., Y. Ogawa, M. Mishina, T. Kono, T. Yokokura, and T. Uchida, Electromagnetic heterogeneity of the seismogenic region of 1962 M6.5 Northern Miyagi Earthquake, northeastern Japan, Geophys. Res. Lett., 28(23), 4371–4374, 2001.

    Article  Google Scholar 

  • National Research Institute for Earth Science and Disaster Prevention (NIED), Seismic activity of the 2007 Noto Peninsula earthquake (Mj6.9), Report of The Coordinating Committee for Earthquake Prediction, 78, 371–373, 2007 (in Japanese).

    Google Scholar 

  • Ogawa, Y., On two-dimensional modeling of magnetotelluric field data, Surveys Geophys., 23, 251–273, 2002.

    Article  Google Scholar 

  • Ogawa, Y. and Y. Honkura, Mid-crustal electrical conductors and their correlations to seismicity and deformation at Itoigawa-Shizuoka Tectonic Line, Earth Planets Space, 56, 1285–1291, 2004.

    Article  Google Scholar 

  • Ogawa, Y. and T. Uchida, A two-dimensional magnetotelluric inversion assuming Gaussian static shift, Geophys. J. Int., 126, 69–76, 1996.

    Article  Google Scholar 

  • Ogawa, Y., M. Mishina, T. Goto, H. Satoh, N. Oshiman, T. Kasaya, Y. Takahashi, T. Nishitani, S. Sakanaka, M. Uyeshima, Y. Takahashi, Y. Honkura, and M. Matsushima, Magnetotelluric imaging of fluids in intraplate earthquake zones, NE Japan back arc, Geophys. Res. Lett., 28, 3741–3744, 2001.

    Article  Google Scholar 

  • Sakai, S., A. Kato, T. Iidaka, T. Iwasaki, E. Kurashimo, T. Igarashi, N. Hirata, T. Kanazawa, and the group for the joint aftershock observation of the 2007 Noto Hanto Earthquake, Highly-resolved distribution of aftershocks of the 2007 Noto Hanto Earthquake by a dense seismic observation, Earth Planets Space, 60, this issue, 83–88, 2008.

    Article  Google Scholar 

  • Siripunvaraporn, W., G. Egbert, and M. Uyeshima, Interpretation of two-dimensional magnetotelluric profile data with three-dimensional inversion: synthetic examples, Geophys. J. Int., 160, 804–814, 2005.

    Article  Google Scholar 

  • Tank, S. B., Y. Honkura, Y. Ogawa, M. Matsushima, N. Oshiman, M. K. Tuncer, C. Celik, E. Tolak, and A. M. Isikara, Magnetotelluric imaging of the fault rupture area of the 1999 Izmit (Turkey) earthquake, Phys. Earth Planet. Inter., 150, 213–225, 2005.

    Article  Google Scholar 

  • Unsworth, M., P. Bedrosian, M. Eisel, G. Egbert, and W. Siripunvaraporn, Along strike variations in the electrical structure of the San Andreas Fault at Parkfield, California, Geophys. Res. Lett., 27(18), 3021–3024, 2000.

    Article  Google Scholar 

  • Uyeshima, M., Y. Ogawa, Y. Honkura, S. Koyama, N. Ujihara, T. Mogi, Y. Yamaya, M. Harada, S. Yamaguchi, I. Shiozaki, T. Noguchi, Y. Kuwaba, Y. Tanaka, Y. Mochido, N. Manabe, M. Nishihara, M. Saka, and M. Serizawa, Resistivity imaging across the source region of the 2004 Mid-Niigata Prefecture earthquake (M6.8), Central Japan, Earth Planets Space, 57, 441–446, 2005.

    Article  Google Scholar 

  • Wannamaker, P. E., Affordable Magnetotellurics: Interpretation in Natural Environments, in Three-dimensional electromagnetics, edited by M. Oristaglio and B. Spies, 709 pp, Soc. Expl. Geophys, Tuls, 1999.

    Google Scholar 

  • Wannamaker, P. E., G. W. Hohmann, and S. H. Ward, Magnetotelluric responses of three-dimensional bodies in layered earths, Geophysics, 49, 1517–1533, 1984.

    Article  Google Scholar 

  • Wessel, P. and W. H. F. Smith, New, improved version of Generic Mapping Tools released, EOS Trans. AGU, 79(47), 579, 1998.

    Article  Google Scholar 

Download references

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Authors and Affiliations

  1. Disaster Prevention Research Institute, Kyoto University, Japan

    Ryokei Yoshimura, Naoto Oshiman, Tsutomu Miura, Yasuyoshi Fujita, Kazuhiro Nishimura, Yu Takagi, Sei Yabe & Mitsuhiro Tada

  2. Earthquake Research Institute, University of Tokyo, Japan

    Makoto Uyeshima, Tsutomu Ogawa & Shigeru Koyama

  3. Volcanic Fluid Research Center, Tokyo Institute of Technology, Japan

    Yasuo Ogawa & Shintaro Nagaoka

  4. Research Center for Prediction of Earthquakes and Volcanic Eruptions, Tohoku University, Japan

    Masaaki Mishina

  5. Department of Earth Sciences, University of Toyama, Japan

    Hiroaki Toh

  6. Department of Earth Science and Technology, Akita University, Japan

    Shin’ya Sakanaka & Mikihiro Imai

  7. Institute of Seismology and Volcanology, Hokkaido University, Japan

    Hiroshi Ichihara, Ryo Honda & Toru Mogi

  8. Department of Civil Engineering, Tottori University, Japan

    Ichiro Shiozaki

Authors
  1. Ryokei Yoshimura
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  2. Naoto Oshiman
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  3. Makoto Uyeshima
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  4. Yasuo Ogawa
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  5. Masaaki Mishina
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  6. Hiroaki Toh
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  7. Shin’ya Sakanaka
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  8. Hiroshi Ichihara
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  9. Ichiro Shiozaki
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  10. Tsutomu Ogawa
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  11. Tsutomu Miura
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  12. Shigeru Koyama
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  13. Yasuyoshi Fujita
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  14. Kazuhiro Nishimura
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  15. Yu Takagi
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  16. Mikihiro Imai
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  17. Ryo Honda
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  18. Sei Yabe
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  19. Shintaro Nagaoka
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  20. Mitsuhiro Tada
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  21. Toru Mogi
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Corresponding author

Correspondence to Ryokei Yoshimura.

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Yoshimura, R., Oshiman, N., Uyeshima, M. et al. Magnetotelluric observations around the focal region of the 2007 Noto Hanto Earthquake (Mj 6.9), Central Japan. Earth Planet Sp 60, 117–122 (2008). https://doi.org/10.1186/BF03352771

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  • DOI: https://doi.org/10.1186/BF03352771

Key words

  • Resistivity structure
  • wideband magnetotellurics
  • 2007 Noto Hanto Earthquake