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Resistivity structure around the focal area of the 2004 Rumoi-Nanbu earthquake (M 6.1), northern Hokkaido, Japan

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Abstract

The Rumoi-Nanbu earthquake (M 6.1) occurred in northern Hokkaido, Japan, on December 14, 2004. We conducted MT surveys along three profiles in and around the focal area to delineate and decipher the structural features of the seismogenic zone. The inverted 2-D resistivity images of the three sections comprised two layers: an upper conductive layer and a lower resistive layer. The boundary of these layers lay at a depth of approximately 3–5 km. A comparison with the surface geology and drilling data revealed that the upper conductive layer and the lower resistive layer corresponded to the Cretaceous—Tertiary sedimentary rocks and older basement rocks, respectively. A clear upheaval of the layer boundary was found along the profile at the center of the focal area. In addition, borehole data indicated an obvious increase in the Young’s modulus toward the lower layer. Therefore, the elastic properties with a complex geometry around the focal zone tended to vary; this probably depicts the zone of stress accumulation that triggered the earthquake.

References

  1. Archie, G. E., The electrical resistivity log as an aid in determining some reservoir characteristics, Trans. Am. Inst. Min. Metall. Pet. Eng., 146, 54–62, 1942.

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

  3. Chatterjee, R. and M. Mukhopadhyay, Effects of rock mechanical properties on local stress field of the Mahanadi basin, India—results from finite element modeling, Geophys. Res. Lett., 29, doi:10.1029/2001GL013447, 2002.

  4. Gamble, T. D., J. Clarke, and W. M. Goubau, Magnetotellurics with a remote magnetic reference, Geophysics, 44, 53–68, 1979.

  5. Geographical Survey Institute, Horizontal strain in the Hokkaido district, Japan, http://www.gsi.go.jp/, 1997.

  6. Groom, R. W. and R. C. Bailey, Decomposition of magnetotelluric impedance tensors in the presence of local three-dimensional galvanic distortions, J. Geophys. Res., 94, 1913–1925, 1989.

  7. Hoffmann-Rothe, A., O. Ritter, and C. Janssen, Correlation of electrical conductivity and structural damage at a major strike-slip fault in northern Chile, J. Geophys. Res., 109, doi:10.1029/2004JB003030, 2004.

  8. Honda, R., H. Kamiyama, T. Yamaguchi, H. Ichihara, and T. Mogi, Gravity survey in and around the focal area of 2004 Rumoi-nanbu earthquake, Northern Hokkaido, Northern Japan, Geophysical bulletin of Hokkaido Univ., 70, 2007 (in press; in Japanese with English abstract).

  9. Ichiyanagi, M., T. Maeda, T. Yamaguchi, H. Takahashi, M. Kasahara T. Sasatani, and A. Yamamoto, Aftershock distribution of the December 14, 2004 Rumoi-nanbu Earthquake (M 6.1) in the northern part of Hokkaido, Japan, Zishin 2, 59, 209–221, 2007 (in Japanese with English abstract).

  10. Iio, Y., T. Sagiya, Y. Kobayashi, and I. Shiozaki, Water-weakened lower crust and its role in the concentrated deformation in the Japanese Islands, Earth Planet. Sci. Lett., 203, 245–253, 2002.

  11. Iio, Y., T. Sagiya, and Y. Kobayashi, Origin of the concentrated deformation zone in the Japanese Islands and stress accumulation process of intraplate earthquakes, Earth Planets Space, 56, 831–842, 2004.

  12. Japan National Oil Corp., Research report on the pilot drilling at “Rumoi” for prospecting petroleum and natural gas in Japan, 86 pp., 1986 (in Japanese).

  13. Mitsuhata, Y., Y. Ogawa, M. Mishina, T. Kono, T. Yokokura, and T. Uchida, Electromagnetic heterogeneity of the seismogenic region of 1962 M 6.5 Northern Miyagi Earthquake, northeastern Japan, Geophys. Res. Lett., 28, 4371–4374, 2001.

  14. Ogawa, Y., On two-dimensional modeling of magnetotelluric field data, Surv. Geophys., 23, 251–272, 2002.

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

  16. Ogawa, Y. and Y. Honkura, Mid-crustal electrical conductors and their correlations to seismicity and deformation at Itoigawa-Shizuoka tectonic line, central Japan, Earth Planets Space, 56, 1285–1291, 2004.

  17. Ogawa, Y., Y. Nishida, M. Uyeshima, Y. Mitsuhata, M. Makino, and Y. Nakayama, Deep crustal structures in Hokkaido, Japan, derived from wide-band magnetotelluric method, Monthly Chikyu, 14, 545–550, 1992 (in Japanese).

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

  19. Park, S. K. and B. Wernicke, Electrical conductivity images of Quaternary faults and Tertiary detachments in the California Basin and Range, Tectonics, 22, doi:10.1029/2001TC001324, 2003.

  20. Sagiya, T., S. Miyazaki, and T. Tada, Continuous GPS array and present day crustal deformation of Japan, Pure Appl. Geophys., 157, 2303–2322, 2000.

  21. Takahashi, H., M. Kasahara, F. Kimata, S. Miura, K. Heki, T. Seno, T. Kato, N. Vasilenko, A. Ivashchenko, V. Bahtiarov, V. Levin, E. Gordeev, F. Korchagin, and M. Gerasimenko, Velocity field of around the Sea of Okhotsk and Sea of Japan regions determined from a new continuous GPS network data, Geophys. Res. Lett., 26, 2533–2536, 1999.

  22. Takakura, S., Precise investigation and interpretation of subsurface resistivity structure by high-density measurement of electrical and electromagnetic methods, Ph.D. thesis, Kyoto University, 348 pp., 2004 (in Japanease).

  23. Tsushima, K., K. Matsuo, and S. Yamaguchi, Geological map of Japan, “Onishika” with explanatory text, 1–17, 1956 (in Japanese with English abstract).

  24. Tsushima, K., K. Tanaka, K. Matsuo, and S. Yamaguchi, Geological map of Japan, “Tappu” with explanatory text, 1–66, 1958 (in Japanese with English abstract).

  25. Unsworth, M. J., P. E. Malin, G. D. Egbert, and J. R. Booker, Internal structure of the San Andreas fault at Parkfield, California, Geology, 25, 359–362, 1997.

  26. 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 (M 6.8), central Japan, Earth Planets Space, 57, 441–446, 2005.

  27. Wannamaker, P. E., T. G. Caldwell, W. M. Doerner, and G. R. Jiracek, Fault zone fluids and seismicity in compressional and extensional environments inferred from electrical conductivity: the New Zealand Southern Alps and U. S. Great Basin, Earth Planets Space, 56, 1171–1176, 2004.

  28. Wessel, P. and W. H. F. Smith, New, improved version of the Generic Mapping Tools released, EOS Trans. AGU, 79, 579, 1998.

  29. Wight, D. E. and F. X. Bostick, Cascade decimation—a technique for real time estimation of power spectra, in Proceedings of the IEEE International Conference on Accoustic, Speech Signal Processing, 626–629, 1980.

  30. Yoshimura, R., N. Oshiman, M. Uyeshima, Y. Ogawa, M. Mishina, H. Toh, S. Sakanaka, H. Ichihara, I. Shiozaki, T. Ogawa, T. Miura, S. Koyama, Y. Fujita, K. Nishimura, Y. Takagi, M. Imai, R. Honda, S. Yabe, S. Nagaoka, M. Tada, and T. Mogi, Magnetotelluric observations around the focal region of the 2007 Noto Hanto Earthquake (Mj 6.9), Central Japan, Earth Planets Space, 60, 117–122, 2008.

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Correspondence to Hiroshi Ichihara.

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Ichihara, H., Honda, R., Mogi, T. et al. Resistivity structure around the focal area of the 2004 Rumoi-Nanbu earthquake (M 6.1), northern Hokkaido, Japan. Earth Planet Sp 60, 883–888 (2008) doi:10.1186/BF03352841

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Key words

  • Magnetotellurics
  • stress concentration
  • intraplate earthquake
  • northern Hokkaido