Guo Xiangyun, Chen Xuezhong, Li Yan’e, Wei Yonggang, Chen Lijuan. 2019: Significance test of focal mechanism consistency:Taking the foreshock sequence of the MS5.4 Xiuyan earthquake on November 29,1999 as an example. Acta Seismologica Sinica, 41(6): 709-722. DOI: 10.11939/jass.20190045
Citation: Guo Xiangyun, Chen Xuezhong, Li Yan’e, Wei Yonggang, Chen Lijuan. 2019: Significance test of focal mechanism consistency:Taking the foreshock sequence of the MS5.4 Xiuyan earthquake on November 29,1999 as an example. Acta Seismologica Sinica, 41(6): 709-722. DOI: 10.11939/jass.20190045

Significance test of focal mechanism consistency:Taking the foreshock sequence of the MS5.4 Xiuyan earthquake on November 29,1999 as an example

  • This paper selected the Euclidean distance DFM to measure the focal mechanism consistency between different earthquakes, and analyzed the relationship between the consistency of focal mechanism and DFM value taking the 1975 ML7.3 Haicheng earthquake sequence and 1999 MS5.4 Xiuyan earthquake sequence as examples. The result shows that when DFM is below 50 the two focal mechanisms become extremely consistent. In order to determine consistency of a number of focal mechanisms the significance test method is drawn into. According to the consistency parameter K proposed by Chen Y, we investigated the consistency of focal mechanism for small earthquakes prior to the MS5.4 Xiuyan earthquake using sign test and Z test. The result suggests that the focal mechanisms of small earthquakes occurred near the MS5.4 Xiuyan main shock are significantly consistent with each other with confidence of 98%. Therefore the method proposed in this paper can be applied to practical earthquake prediction effectively.
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