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针对地震前经常出现的地震活动图像异常展开研究,分析了首都圈地区1970年以来MS5.0级以上中强震前地震活动图像的变化特征。结果显示,首都圈地区8次(组)MS5.0级以上地震前,在震源区附近均出现了地震条带和逼近地震,震前有87.5%的逼近地震距主震130 km内;87.5%地震前在震源区附近出现了孕震空区,并在空区边缘或空区内部出现了逼近地震。最后对地震活动图像异常特征与首都圈地区中强震的相关性进行了讨论。
Aiming at the anomalous images of seismicity that occur frequently before earthquakes, this paper analyzes the characteristics of the seismic activity before the MS5.0 and above moderate earthquakes in the metropolitan area since 1970. The results show that seismic bands and approaching earthquakes occurred in the vicinity of the source area before the MS8.0 MS8.0 earthquakes in the metropolitan area. Before the earthquake, 87.5% of the approaching earthquakes were within 130 km of the main shock and 87.5% Before the earthquake, there was a pregnant vacant area in the vicinity of the focal area, and an approaching earthquake appeared on the edge of the empty area or inside the empty area. Finally, the correlation between the anomalous features of seismic activity and the moderate strong earthquakes in the metropolitan area is discussed.