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本文利用区域地震迁移“速率”这一参数,讨论了唐山7.8级大震前区域中,小地震活动的时空异常图象,结果表明,唐山地震前“速率”参数出现低值异常现象。为求异常的真实性,在划定的区域内,分不同区域,不同震级段进行计算,其结果均出现较长时间的低值异常,并且和本区地震波应变能释放曲线与地震频次基本相吻合。本文认为速率参数反映了大震前的地震活动在空间上的密集与在时间上的平静这两方面的特征。
In this paper, the spatial-temporal anomalous image of small-scale seismic activity in the area prior to the MS8.8 Tangshan earthquake is discussed using the “velocity” of regional seismic migration. The results show that the “velocity” parameter shows a low anomaly before the Tangshan earthquake. For the purpose of determining the anomaly of the anomaly, it is calculated in different regions and different magnitudes within the designated area. The results show a long time low anomaly, and the correlation between the release curve of seismic wave strain and the basic phase of seismic frequency Anastomosis. This paper argues that the velocity parameters reflect the characteristics of both the seismic intensity in time and the seismism in time before the earthquake.