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The locations of about 400 earthquakes in Yangjiang,Guangdong Province are determined using the double-difference earthquake location algorithm(DDA).The seismicity pattern becomes concentrated from discrete grids.The rupture characteristics of the Yangjiang earthquake sequence show a conjugated distribution in NW and NE directions.The major distribution trends NE and dips NE with an angle of 30° and a length of 30km,and the minor distribution trends NW and dips SE with an angle of 30° and a length of 20km.The focal depth is 5km～15km.The distribution of the Enping earthquake sequence,which is not far from Yangjiang,is NW-trending.The relationship between hypocenter distribution and geological structure is discussed.
The locations of about 400 earthquakes in Yangjiang, Guangdong Province are determined using the double-difference earthquake location algorithm (DDA). The seismicity pattern became concentrated from discrete grids.The rupture characteristics of the Yangjiang earthquake sequence show a conjugated distribution in NW and NE directions.The major distribution trends NE and dips NE with an angle of 30 ° and a length of 30km, and the minor distribution trends NW and dips SE with an angle of 30 ° and a length of 20km.The focal depth is 5km ~ 15km The distribution of the Enping earthquake sequence, which is not far from Yangjiang, is NW-trending. The relationship between hypocenter distribution and geological structure is discussed.