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Analysis on Seismogenic Structure and Seismic Activity Characteristics of Yingjiang M_S5.8 Earthquake
Pages: 390-398
Year: Issue:  3
Journal: Journal of Seismological Research

Keyword:  seismotectonicearthquakes swarm activityYingjiang MS5.8 earthquakeDayingjiang Fault;
Abstract: On the basis of the regional seismotectonic background,the neotectonic movement and the regional tectonic stress field of Yingjiang and its adjacent area,we preliminarily analyzed the tectonic activity characteristics of Yingjiang MS5.8 earthquake with the aspects of the intensity isoseismal line,the earthquake sequence,the surface deformation belt and the focal mechanism solution.The results show that the sinistral strike-slip activities of Dayingjiang Fault in NE trend triggered the Yingjiang MS5.8 main shock,and the main shock and foreshock sequences reflected the characteristic of the conjugate rupture activity of the Dayingjiang Fault in NE trend and Sudian-Yingjiang Fault in NS trend.Combined with the regional historical earthquake situation and seismic activity before and after Yingjiang MS5.8 main shock,we preliminarily discussed the seismic activity characteristics in Yingjiang region and got the conclusion that the earthquake swarm was the main feature of the seismic activity in Yingjiang region,and the occurrence of Yingjiang MS5.8 is the result of continued-enhanced activity of MS4.0earthquakes swarm in early 2011.
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