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根据海城、唐山和松潘—平武地震的地震前兆、地震序列和地质构造资料,提出了在地震孕育和发生过程中,不仅主震断层面有明显的活动,与之共轭的另一组断层面也有重要作用。在震中区,前震和余震可能分布于一对共轭断层面上,而不只是局限于主震断层面。地震前兆的分布范围存在于比震中区更为广大的一个区域内,该区内共轭断层网络中的某些断层带常成为前兆异常分布带或集中区。其形成原因可以用区域应力场中应力集中和沿共轭剪切网络所产生的破裂及滑动来解释。
According to the earthquake precursors, seismic sequences and geological structure data of Haicheng, Tangshan and Songpan-Pingwu earthquakes, it is proposed that in the process of geocession and occurrence, not only obvious active faults in the fault plane of the main shock but also conjugate with the other Fault planes also play an important role. In the epicenter area, the foreshocks and aftershocks may be distributed over a pair of conjugate fault planes, not just the main fault plane. The distribution range of earthquake precursors lies in a region broader than the epicentral region. Some fault zones in the conjugate fault network in this region often become precursory anomalous distribution or concentration zones. The reason for its formation can be explained by stress concentration in the region stress field and rupture and slip along the conjugate shear network.