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Volume 57 Supplement 5

Special Issue: Special Section for the 2004 Mid-Niigata Prefecture Earthquake (1)

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

Earth, Planets and Space volume 57, pages 429–433 (2005)Cite this article

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.

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Authors and Affiliations

  1. Graduate School of Sciences, Kyushu University, Shin’yama, Shimabara, Nagasaki, 855-0843, Japan

    Masahiro Korenaga

  2. Institute of Seismology and Volcanology, Faculty of Science, Kyushu University, Japan, Shin’yama, Shimabara, Nagasaki, 855-0843, Japan

    Satoshi Matsumoto, Takeshi Matsushima & Kenji Uehira

  3. Research Center for Earthquake Prediction, Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan

    Yoshihisa Iio & Takuo Shibutani

Authors
  1. Masahiro Korenaga
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  2. Satoshi Matsumoto
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  3. Yoshihisa Iio
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  4. Takeshi Matsushima
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  5. Kenji Uehira
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  6. Takuo Shibutani
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Corresponding author

Correspondence to Satoshi Matsumoto.

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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

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  • DOI: https://doi.org/10.1186/BF03351829

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