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

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  • Korenaga Masahiro
    Graduate School of Sciences, Kyushu University
  • Matsumoto Satoshi
    Institute of Seismology and Volcanology, Faculty of Science, Kyushu University
  • Iio Yoshihisa
    Research Center for Earthquake Prediction, Disaster Prevention Research Institute, Kyoto University
  • Matsushima Takeshi
    Institute of Seismology and Volcanology, Faculty of Science, Kyushu University
  • Uehira Kenji
    Institute of Seismology and Volcanology, Faculty of Science, Kyushu University
  • Shibutani Takuo
    Research Center for Earthquake Prediction, Disaster Prevention Research Institute, Kyoto University

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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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