Skip to main content

Three dimensional velocity structure around aftershock area of the 2004 mid Niigata prefecture earthquake (M6.8) by the Double-Difference tomography

Abstract

The 2004 mid Niigata prefecture earthquake with M6.8 occurred in the north of central part of Japan. It was a reverse fault by the regional compression stress field in NW-SE direction. Several aftershocks with M≥6 were occurred. The large aftershocks occurred on plural fault planes. The plane was either parallel or normal to the main shock one. We estimated three dimensional velocity structures in and around the focal area of the earthquake by using a Double Difference tomography method. The arrival time data were picked from seismograms at the deployed seismic stations settled by Kyoto and Kyushu universities in collaboration, NIED, ERI, and JMA. The velocity structure showed that a low velocity zone existed in the northwest part of the aftershock area. On the contrary, the velocity in the southeast became high. Moreover, the fault plane of the main shock inferred from the aftershock distribution was located at the velocity boundary.

References

  1. Aoki, S., M. Nishi, K. Nakamura, T. Hashimoto, S. Yoshikawa, H. M. Ito, Multi-planar structures in the aftershock distribution of the Mid Niigata prefecture Earthquake in 2004, Earth Planets Space, 57, this issue, 403–409, 2005.

    Article  Google Scholar 

  2. Kato, A., E. Kurashimo, N. Hirata, T. Iwasaki, and T. Kanazawa, Imaging the source region of the 2004 Mid-Niigata prefecture earthquake and the evolution of a seismogenic thrust-related fold, Geophys. Res. Lett, 2005 (in press).

    Google Scholar 

  3. Honda, R., S. Aoi, N. Morikawa, H. Sekiguchi, T. Kunugi, and H. Fujiwara, Ground Motion and Rupture Process of the 2004 Mid Niigata Prefecture Earthquake Obtained from Strong Motion Data of K-NET and KiK-net, Earth Planets Space, 2005 (submitted).

    Google Scholar 

  4. Okada, T., A. Hasegawa, J. Suganomata, N. Umino, H. Zhang, and C. Thurber, Imaging the fault plane and asperities of the 2003 M6.4 northern Miyagi earthquake, NE Japan, by double-difference tomography, Earth. Planet. Sci. Lett., 2005a (submitted).

    Google Scholar 

  5. Okada, T., N. Umino, T. Matsuzawa, J. Nakajima, N. Uchida, T. Nakayama, S. Hirahara, T. Sato, S. Hori, T. Kono, Y. Yabe, K. Ariyoshi, S. Gamage, J. Shimizu, J. Suganomata, S. Kita, S. Yui, M. Arao, S. Hondo, T. Mizukami, H. Tsushima, T. Yaginuma, A. Hasegawa, Y. Asano, H. Zhang, and C. Thurber, Aftershock distribution and 3D seismic velocity structure in and around the focal area of the 2004 mid Niigata prefecture earthquake obtained by applying double-difference tomography to dense temporary seismic network data, Earth Planets Space, 57, this issue, 435–440, 2005b.

    Article  Google Scholar 

  6. Sakai, S., N. Hirata, A. Kato, E. Kurashimo, T. Iwasaki, and T. Kanazawa, Multi-fault system of the 2004 Mid-Niigata Prefecture Earthquake and its aftershocks, Earth Planets Space, 57, this issue, 417–422, 2005.

    Article  Google Scholar 

  7. Shibutani, T., Y. Iio, S. Matsumoto, H. Katao, T. Matsushima, S. Ohmi, F. Takeuchi, K. Uehira, K. Nishigami, B. Enescu, I. Hirose, Y. Kano, Y. Kohno, M. Korenaga, Y. Mamada, M. Miyazawa, K. Tatsumi, T. Ueno, H. Wada, and Y. Yukutake, Aftershock Distribution of the 2004 Niigata- Chuetsu Earthquake (Mj = 6.8) and Heterogeneous Structure in and Around the Source Region, Earth Planets Space, 57, 2005 (submitted).

  8. Zhang, H. and C. Thurber, Double-Difference Tomography: the method and its application to the Hayward Fault, California, Bull. Seism. Soc. Am., 93, 1875–1889, 2003.

    Article  Google Scholar 

Download references

Author information

Affiliations

Authors

Corresponding author

Correspondence to Satoshi Matsumoto.

Rights and permissions

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Cite this article

Korenaga, M., Matsumoto, S., Iio, Y. et al. Three dimensional velocity structure around aftershock area of the 2004 mid Niigata prefecture earthquake (M6.8) by the Double-Difference tomography. Earth Planet Sp 57, 429–433 (2005). https://doi.org/10.1186/BF03351829

Download citation

Key words

  • Velocity structure
  • DD tomography
  • 2004 mid Niigata
  • prefecture earthquake