本文主要研究唐山7.8级强震以来,华北地区(32°—41°N,106°—122°E)地电阻率异常与成丛集中活动的5—6级中强震地震间的关系。研究表明,中强地震地电阻率异常特征非常复杂,异常的时间一般只有60—90天,异常的幅度也只有1％—2％。尽管如此,仍可得到与中强地震丛有关的某些有益的地电前兆信息。 This paper mainly studies the relationship between the resistivity anomalies in the North China area (32 ° -41 ° N, 106 ° -122 ° E) and the moderate-moderate earthquakes of magnitude 5-6 in the concentrated craton, since the MS7.8 Tangshan earthquake. The research shows that the resistivity anomaly characteristics of moderate strong earthquakes are very complicated, the anomalous time is only 60-90 days, and the anomaly amplitude is only 1% -2%. Nevertheless, some useful information about geoelectric precursors related to moderate earthquakes can still be obtained.