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收集了自1989年至1993年10月天津及其附近地区发生的M_L≥4.0地震和大同地区发生的中强地震共21次,经统计计算认为:天津台网对唐山地区发生的地震反映能力较强,北京地区次之,对大同地区发生的中强地震有一定的反映能力。其综合映震能力为61.9％,可预报能力为23.8％,异常对应能力不超过55.7％,观测项目综合灵敏度为24％,对天津及其附近地区发生的中等地震平均仅可能有3.17％观测项目产生异常。统计中发现,天津前兆台网观测项目在中等地震前的异常以地下流体异常为主,其比例占异常总数的92％,体现出其在地震监测与预报中的重要性,为一项重要的观测手段,在今后的工作中其观测应大力加强。
A total of 21 M_L≥4.0 earthquakes occurred in Tianjin and its vicinity from 1989 to October 1993 and moderate-strong earthquakes occurred in the Datong area were collected. According to the statistics, it is believed that the seismic response capability of Tianjin Network to Tangshan area Strong, second in Beijing, the moderate earthquake occurred in Datong area have a certain ability to reflect. The comprehensive seismic capacity is 61.9%, the predictability is 23.8%, the abnormal corresponding capacity is less than 55.7%, the comprehensive sensitivity of the observation project is 24%, and only 3.17% of the moderate earthquakes occurred in Tianjin and its vicinity may be observed. Abnormal. It is found in the statistics that the anomalies of the precursor network observation project in Tianjin before the moderate earthquakes are dominated by underground fluid anomalies, accounting for 92% of the total number of anomalies, reflecting their importance in earthquake monitoring and prediction. This is an important Observation means that its observations should be greatly strengthened in future work.