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Volume 60 Supplement 2

Special Issue: Special Section for the 2007 Noto Hanto Earthquake (1)

Comparison of early aftershock sequences for the 2004 Mid-Niigata and 2007 Noto Hanto earthquakes in central Japan

Earth, Planets and Space volume 60, pages 151–154 (2008)Cite this article

Abstract

We examined continuously recorded seismograms of the 2004 Mid-Niigata and 2007 Noto Hanto earthquakes to compare the early aftershocks for these two similar earthquakes in central Japan. Although the two mainshocks had similar size, depth, and focal mechanisms, the aftershock levels were quite different, with the Niigata case being much stronger. The results of our analyses show that the early aftershock occurrences for the two events were quite similar for the first several minutes. About 7 minutes after the Niigata mainshock, significantly enhanced aftershock triggering began and continued for the duration of that aftershock sequence. We speculate that the change that occurred in the Niigata region may be due to fluid effects in the fault zone.

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Authors and Affiliations

  1. Disaster Prevention Research Institute, Kyoto University, Japan

    Jim Mori & Yasuyuki Kano

  2. GeoForschungsZentrum, Potsdam, Germany

    Bogdan Enescu

Authors
  1. Jim Mori
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  2. Yasuyuki Kano
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  3. Bogdan Enescu
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Correspondence to Jim Mori.

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Mori, J., Kano, Y. & Enescu, B. Comparison of early aftershock sequences for the 2004 Mid-Niigata and 2007 Noto Hanto earthquakes in central Japan. Earth Planet Sp 60, 151–154 (2008). https://doi.org/10.1186/BF03352777

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  • DOI: https://doi.org/10.1186/BF03352777

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