Abstract:

The observation of seismic resistivity plays an important role in earthquake monitoring and prediction. Due to the acceleration of urbanization, the observation environment of surface resistivity stations is seriously disturbed. In order to suppress environmental interference, geoelectric scientists have carried out underground geo-resistivity observation and research since the 1980s. In this paper, the research on the development of underground geo-resistivity observation in China is reviewed. The suppression ability of stray current and metal pipelines, the relationship between annual variation of underground geo-resistivity caused by seasonal variation and observation device, and the seismic reflection efficiency are evaluated and analyzed. The advantages of underground geo-resistivity observation are described: it can suppress the interferences caused by abnormal bodies and seasonal changes, weaken the influence of surface stray current obviously, reduce the annual variation range of resistivity effectively, and solve the problem of increasingly serious surface environmental interferences. With the development of seismic monitoring and prediction from empirical prediction to physical prediction, more and more attention will be paid to the establishment and application of underground geo-resistivity observation system.

Key words:  underground geo-resistivity, stray current, annual variable amplitude, metal pipeline, earthquake