Source parameters determination for earthquakes in Kushiro, Japan considering source time function
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  • 作者:Lifen Zhang (1) (2)
    Wulin Liao (1)
    Guichun Wei (1)
    Jinggang Li (1)
    Qiuliang Wang (1)
  • 关键词:moment tensor inversion ; half duration ; source time function ; Kushiro ; P315.3
  • 刊名:Earthquake Science
  • 出版年:2012
  • 出版时间:April 2012
  • 年:2012
  • 卷:25
  • 期:2
  • 页码:137-142
  • 全文大小:549KB
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  • 作者单位:Lifen Zhang (1) (2)
    Wulin Liao (1)
    Guichun Wei (1)
    Jinggang Li (1)
    Qiuliang Wang (1)

    1. Institute of Seismology, China Earthquake Administration, Wuhan, 430071, China
    2. Institute of Geophysics, China Earthquake Administration, Beijing, 100081, China
  • ISSN:1867-8777
文摘
This paper applies a new formulation to do moment tensor inversion for earthquakes in the Kushiro area of Japan. Comparing with conventional moment tensor inversion method, the new one takes the effect of source time function into consideration. For the inversion, best solution is obtained by minimizing the difference between the observed seismograms and the synthetic ones. And the best-fitting focal depth is determined from the variance reduction. The results indicate that half duration of source time function is proportional to the magnitude of earthquakes. Large earthquakes have long half duration, whereas that of moderate-small earthquakes is comparatively shorter. The focal mechanisms of all three earthquakes are of thrust fault type, which is mainly ascribed to the collision of the North American plate with the Eurasia plate in the late Cretaceous or Paleogene.

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