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本文以震群型的邢台大震序列、主震—余震型的唐山大震序列、前震—主震—余震型的海城大震序列为例,取余震区中的余震来研究强余震前的b值异常变化。结果发现,强余震前的b值确实发生异常变化,其变化形态与大震前b值在较大区域内的变化相似,即震前有个明显的峰值期。而且,这种变化形态与地震序列类型无明显的关系。强余震与大震前b值变化的相似性,可能表明发生在余震区中的强余震也经历着与大震孕育发展的类似过程。但孕震时间比大震短。利用余震区内的强余震震前的b值异常变化,可对大震后不太长的时间内的强余震进行临震预测。
In this paper, taking the sequence of the earthquake-swarm Xingtai earthquake, the Tangshan earthquake sequence of the main shock-aftershock type and the Haicheng earthquake sequence of the foreshock-mainshock-aftershock type as an example, taking the aftershocks in the aftershock area as an example, Abnormal changes in b values. The results show that the b value before strong aftershock does change anomalously, and its variation is similar to the change of b value in a large area before the large earthquake, that is, there is an obvious peak before the earthquake. Moreover, this type of change has no obvious relationship with the types of seismic sequences. The similarity of the b values before and after the strong aftershocks may indicate that the strong aftershocks that occurred in the aftershocks also experienced a similar process to the development of the large earthquakes. However, the earthquake time is shorter than the earthquake. Using the abnormal change of b value before the strong aftershock in the aftershock area, we can forecast the strong aftershocks in the not too long time after the epicenter.