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中强地震大多发生在活动断裂带上,研究这些地震带的应力状态及其带上所发生地震的时空特征,对于探索大地震前的前兆信息是非常重要的。分析1970年以来华北6级以上地震前地震区内的地震活动,发现在震前2—3年,中小地震的空间分布有向地震带内收缩的趋势,而在临震前1—2个季度,又表现为向带外发散。这种震前地震活动分布向条带内收敛和发散的趋势为地震预报提供了一定的信息。
Most of the moderately strong earthquakes occur on the active fault zones. Studying the stress state of these seismic zones and the spatiotemporal features of the earthquakes occurring in these zones is very important for exploring the precursory information before the earthquake. The seismic activity in the earthquake area before the M 6+ earthquake in North China since 1970 is analyzed. It is found that the spatial distribution of the medium-small earthquakes tends to shrink within the seismic band 2-3 years before the earthquake. In the 1-2 quarters before the earthquake , But also showed divergence to the band. The tendency of the distribution of seismic activity before the earthquake to the convergence and divergence within the band provides certain information for earthquake prediction.