地震地电阻率交流观测方法及观测实验

介绍地震地电阻率交流观测的原理及方法、观测系统的要求及主要技术指标，并在受地铁干扰严重的江宁台进行实验观测。初步观测结果表明，该系统观测结果与直流观测结果相当，能满足台站实际观测需求，同时达到抗干扰目的。证明采用交流供电方法进行地电阻率观测，能够在较强干扰背景下获取较高的信噪比，很好地抑制城市地铁、轻轨以及其他因素引起的电磁干扰。

AC Geo-Electrical Resistivity Observation Method and Experimental Observation

In the paper, we describe in detail the observation principle, then introduce the design of a new model AC geo-electrical resistivity measurement system. Finally, we show the preliminary experimental results, carried out in Jiangning observatory, Jiangsu province. These experimental results show that AC geo-electrical resistivity observation method can decrease the electromagnetic interference caused by the environment, meeting geo-electrical resistivity observation requirements.It is proved that the AC geo-electrical resistivity observation method could obtain high signal-noise ratio when working in strong interference observation environment, especially to decrease the interference caused by subway.