华北地区断层形变异常与地震活动

根据断层形变求解的华北地区异常参数和应变累积率，研究了华北主要断裂带的断层形变异常及其应震特征。同一断裂带上的形变异常与该带上的地震有较好的对应性。河套-张家口-蓬莱活动构造带上发生的强震，北京地区的断层形变异常参数在总体上几乎都有明显的前兆性异常。山西带北部的断层形变异常参数对山西断陷带及其延伸部位上的强震同样有较好的反映。断层应变累积率反映了应力的积累程度，其值相对较大时，测点所在地区的地震较活跃，反之亦然。

Study of fault deformation anomaly and seismic activity in North China

In order to study the characteristic relation between the fault deformation anomaly from some main fault zones and their seismic activities, the anomaly parameters and strain accumulation rate in North China are evaluated based on the fault deformation in this paper. The correlation between the fault deformation anomalies from same fracture zones and their earthquake occurrence is of well correspondence. The occurrence of strong earthquakes along Hetao-Zhangjiakou-Penglai active structure zone, show that the parameters of the fault deformation anomaly in Beijing area present the features of obvious precursory anomaly as a whole. The parameters of the fault deformation anomaly from northern part of Shanxi zone reflected the strong earthquake activity along Shanxi fault subsidence zone and its extension section. The rate of the fault strain accumulation shows the size of the stress accumulation, when its value is larger; the region where the surveying site is located, earthquake activity is frequent, or otherwise.