将地电阻率台站地下介质简化为水平层状均匀介质模型，以点电流模拟地表干扰电流源，针对对称四极观测装置，计算干扰源电流增减及位置变化对地电阻率观测的影响。结果表明，地电阻率的受干扰程度取决于地表干扰点电流的大小、在测区的方位及距中心点的距离。

The medium under the geoelectrical resistivity station is simplified as a model of horizontally homogeneous layer medium. The disturbance current on the earth's surface is substituted with a point current source. The influence quantity for the geoelectrical resistivity measurement is calculated for a symmetrical four-electrode resistivity observation configuration(a fixed quasi-Schlumberger) when the size and position of disturbance current are changing. The calculated results suggest that the influence quantity caused by disturbance current of the earth's surface is determined by the size and azimuth of current,and the distance from the center of the survey area. The result is important forthe abnormal verification of disturbance current.

P315

国家自然科学基金（41274079）、中国地震局震情跟踪定向工作任务青年课题（2015010403）共同资助