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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.

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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

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