华北北部3次中强地震前的地电阻率异常变化

分析研究了华北北部地区近几年内发生的３次中强地震前后距其震中一定范围内的地电阻率异常现象及其特征。用地电攻关结果进行检验，效果较好。再次表明，地电阻率法是一种颇有前景的地震监测预报方法。

Earth Resistivity Anomaly Variation before 3Mo-derate Earthquakes in the North of North China

The earth resistivity anomalies and its features before 3 moderate earthquakes occurred in some rangearound the epicenters in the north of North China of recent years are analyzed.The, effect of the examinationby using the key task research achievements is fairly good,and again shows that the earth resistivitymethod is a prospective seismic surveilance and prediction method.