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本文利用地震波资料求得了1979年5月22日湖北巴东5.1级地震震源机制解。利用震前孕震区内最大垂直地形变异常量,按照平面应力状态下的点源模型推算了该震的震源动力学参数。探讨了地震发生前数年的微震及前震、余震的活动,表明前震、余震的分布与主震的P波节线的方位有关,证明了该区受黄陵背斜边界构造控制的北东向隐伏断裂的新活动。研究了该震震源机制与地形变的关系,并对该震发生的力学成因问题作了分析,提出了应加强监视的地区。
This paper uses the seismic data to obtain the focal mechanism solution of the May 2011 Badong 5.1 Earthquake in Hubei Province on May 22, 1979. According to the point source model under plane stress, the source kinetic parameters of the earthquake were calculated by using the maximum vertical topographic variation anomaly before the earthquake. The microseismic and pre-earthquake and aftershock activities for several years before the earthquake were discussed. It is shown that the distribution of foreshocks and aftershocks is related to the orientation of the P wave nodal line of the main shock. It is proved that this area is influenced by the NE direction controlled by the Huangling anticline boundary structure New activity of hidden faults. The relationship between the focal mechanism and the deformation of the terrain was studied. The causes of the earthquake were analyzed, and the areas to be monitored should be put forward.