1987年江西寻乌5.4级地震及1994年台湾海峡7.3级地震前中小地震活动图像特征-华南地震

文章信息/Info

Title:: Images Characteristics of Seismic Activity before 1987 Xunwu M 5.4 Earthquake in Jiangxi Province and 1994 Taiwan Strait M 7.3 Earthquake

Author(s):: CHEN Daqing; YANG Xue; Guandong Earthquake Agency，Guangzhou，510070，China

Keywords:: Xunwu earthquake; Taiwan Strait earthquake; Seismic activity images; Focal mechanism

摘要:: 通过震前中小地震的时空分布图和结合构造分区的D-T图对1987年江西寻乌5.4级地震及1994年台湾海峡7.3级地震震前活动图像特征做了研究。两次地震主破裂面都为北西向，但破裂方式不同。研究发现震前压应力区闭锁地震活动减弱，张应力区中小地震活动呈活跃的趋势。通过主震前全时空的地震活动图像分析方法，对2次地震前的中小地震活动特征进行了分析，并结合震源机制给出了一些有益的结论。

Abstract:: The spatial-temporal distribution of the earthquake and the D-T diagram of the structural partition before Xunwu M 5.4 earthquake in Jiangxi province in 1987 and Taiwan Strait M 7.3 earthquake in 1994 were studied. The main fracture surfaces of the two earthquakes are northwest，but the rupture mode is different. The study found that the seismic activity of the compressive stress zone is weakened before the earthquake，while the small and medium earthquake activity in the tensile stress zone is active. Based on the analysis of the seismic activity image before the 2 main shocks, this article analyzed the characteristics of small and medium earthquakes before the 2 earthquakes, and gave some useful conclusions in combination with the focal mechanism.