DISCUSSION ON THE GENESIS OF M=6.4 YANGJIANG EARTHQUAKE IN 1969
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    Abstract:

    This paper deals with the seismic genesis of M=6.3 Yangjiang earthquake in 1969 bymeans of the situation when the quake occurred, its focus geological background and epigene adjustment action.
    This earthquake mentioned in the paper occurred along NEE fault, with strike slip fault shifting and stronger P wave emission in the direction of S by W. But then the regional tectonic pressure acted upon the fault was of the SEE trending, and at the same time, it was overlapped by a vertical force exerted upon the seismic focus bottom.
    This paper analyses the geological background in the seismic area and points out that the seismic stress accumulative unit length was 40 km and the focus was formed by the forces mentioned above.M=6.4 earthquake was generated owing to the focus stress accumulation and focus modulation by epigene adjustment action. After earthquake, the fault upper wall was down-punched, resulting in the submergence of ground in the epicentral area and increase of inclined slip component of aftershock meshanism.

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History
  • Received:May 04,1986
  • Revised:
  • Adopted:
  • Online: June 30,2017
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