【摘要】 共和 7.0级地震的发生及共和盆地内古地震遗迹的发现 ,说明共和盆地不属于低烈度区 ,其地震危险性是不容忽视的 .在诸多学者研究的基础上 ,分析了共和地震的构造背景 ,讨论了共和地震的孕震过程 .发现该次地震的孕育经历了近 2 0年 ,并且可以分为长、中、短、临 4个阶段 ,反映了地壳介质由弹性形变、朔性形变、硬化直至破裂的过程更多还原

【Abstract】 It is proved Gonghe basin is not low intensity zone by the 1990 Gonghe M S7.0 earthquake and traces of palaeoearthquake in the basin.It’s seismic risk should not be ignored. Based on a large number of studies,geologic background of the Gonghe earthquake is analysed and seismogenic process of the event is discussed. The result shows that development period of the event is about 20 years and can be divided into 4 stages, that is, long term, medium term, short term and impending term, reflecting the process from elastic deformation,ductile deformation, harding strain to precursory creep of crustal medium.更多还原