井下地电观测是在地电观测中规避地表环境干扰的手段之一。针对井下地电观测装置长期稳定性的迫切需求，本文介绍了适用于井下地电观测中室外线路的内部结构、制作工艺、制作材料和可靠性检测结果等。本文所述型号的电缆能适用于开展井下数百米深度的地电观测，可保障井下地电观测装置的长期稳定性，是今后发展井下地电观测的关键技术。

Deep underground observation is one of the future geoelectric observation methods for earthquake monitoring and prediction in China. This method is good for overcoming and reducing surface environment interference. In response to the demand of long-term stability of observation configuration in deep underground observation,this paper introduces a deep underground cable that involves the cable internal structure,making processes and preferred materials as well as the reliability test results. This type of cables can be used in geoelectric observation in deep underground. This cable can make sure the long-term stability of geoelectric observation configuration in deep underground,and also is a key technology to further continue the geoelectric observation in underground in China.

P315

2015年中国地震局星火计划（XH16015）资助