2004年新潟県中越地震の発生過程

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書誌事項

タイトル別名
  • Generating Process of the 2004 Mid Niigata Prefecture Earthquake
  • オンライン合同余震観測結果から
  • Based on the Results from the Joint Online Aftershock Observation

抄録

The 2004 Mid Niigata Prefecture Earthquake (MJMA 6.8) occurred on 23 October 2004. The mainshock was followed by four aftershocks with MJMA≥6.0. This earthquake is located in the Niigata-Kobe Tectonic Zone in which large strain rates (>0.1ppm/y contraction) have been observed by GPS data. We deployed three temporary online seismic stations in the aftershock area. Combining data from the temporary stations and from permanent stations around the aftershock area, we determined aftershock locations, and estimated the structures and the stress change in and around the aftershock region. Based on these results, we suggested a generating process of the 2004 Mid Niigata Prefecture Earthquake supposing that a very weak region exists in the weak zone in the lower crust just beneath the seismogenic fault.

収録刊行物

  • 地震　第２輯

    地震　第２輯 58 (4), 463-475, 2006

    公益社団法人 日本地震学会

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