【摘要】 地电阻率观测是地震前兆观测的重要手段之一.从唐山地震、松潘地震、澜沧-耿马地震到2008年的汶川大地震,震前地电阻率都观测到明显的异常.但随着国民经济的快速发展,地电阻率的观测环境受到各种干扰,其中采用直流牵引技术的城市轨道交通干扰尤为严重,致使一些地电阻率观测台站的观测数据无法满足规范要求,部分台站因此被迫搬迁.本文通过对部分受城市轨道交通干扰比较严重的台站进行测试分析,对现有观测系统的抗干扰能力进行了分析,提出了一些抗干扰措施,为进一步提升地电阻率观测质量做了技术铺垫.更多还原

【Abstract】 Geoelectric resistivity observation is one of the important means for earthquake precursor observation. Before the Tangshan earthquake, Songpan earthquake, Lancang-Gengma earthquake and the 2008 Wenchuan earthquake, obvious geoelectric resistivity anomaly had been observed. But with the rapid development of national economy, geoelectric resistivity observation environment has met various kinds of disturbances, especially the disturbance from urban rail transit that uses DC traction power supply system, and some observation stations had to be relocated because their records could not meet standard requirements. In this study, we conducted an analysis on the anti-disturbance capability of the current observation system in China by analyzing the disturbance caused by urban rail transit at two geoelectric stations, and proposed some measures to reduce its influence on geoelectric observation.更多还原