【摘要】 收集整理2000年以来华北、东北地区20余个台站记录的地电场分钟值观测资料，利用潮汐波岩体裂隙水(电荷)流动模型，计算台站的地电场优势方位角，结果表明：华北、东北地区5级以上浅源地震地电场方位角异常明显，多以45°偏转和收窄变化为主；深源地震的地电场方位角异常不明显。以上现象进一步说明大地电场优势方位角与岩石裂隙结构密切相关。更多还原

【Abstract】 With the model of telluric field rock cracks,this work analyzes more than 20 stations in North and Northeast China using minute-sampled electric field observations since 2000.The results show that the telluric field rock cracks derived from electric field observations are affected by the leakage of HVDC transmission at the trial operation stage.We find obvious anomaly changes of telluric field rock cracks before M_S≥5 shallow earthquakes within 300 km to the epicenters.At these sites occurred more easily structural variations such as rock shear cracks,deflection of preferred orientation and narrowing.But the anomaly change is not obvious before M_S≥5 deep earthquakes.更多还原