【摘要】 本文简要介绍了天水井下地电阻率观测系统场地布设及观测方式,对井下多种方式观测资料进行了对比研究,并结合芦山MS7.0、岷县MS6.6级地震进行了分析。结果表明:深层水平地电阻率在2次地震发生前,均出现了明显的短临异常,其他观测方式短临异常不是特别显著;同时对降水、雷电以及观测系统故障干扰影响深层地电阻率观测做了分析与讨论。与传统地电阻率观测相比,采用井下观测系统能减少干扰、提高信噪比,能缓解地电观测与经济建设的矛盾,是地电观测方式的新探索。更多还原

【Abstract】 This paper we briefly introduce the station-layout and the observing methods of the underground observational system at Tianshui seismic station at first. Then we conduct comparative study on the multiple geo-electric observational data from underground well. Our results of deep layer geo-resistivity data show obviously short-impending precursor information before Lushan MS7.0 and Minxian MS6.6 earthquake, whereas other observation systems did not show particularly remarkable short impending anomalies. Finally, we discuss the influence of seasonal rainfall,lightning and observational system on the deep geo-resistivity observation. Compared with the traditional geo-resistivity observation, we find that the underground observational system can effectively reduce the interference, increase the signal to noise ratio, and ease the contradiction between geo-electrical observation and economical construction.更多还原