成都地震监测中心站地电阻率交、直流2套观测系统为并行观测，选取2022年1—2月观测数据，分别从观测结果、抗地铁干扰、对同台地磁观测影响等方面进行对比分析，结果表明，2套观测系统地电阻率测值相近，交流观测系统精度更高，数据质量更佳，抗地铁干扰性能良好，且在供电测量时不会对同台地磁观测造成干扰影响。通过对比分析，有利于加深对观测系统和各类干扰的认识，并为其他电磁观测台站提供参考。
Two geo-resistivity observation systems thatuse DC and AC power supplies are operated in parallel at the Chengdu Seismic Monitoring Central Station. The observational data from January to February 2022 were selected, and the comparative analysis was carried out in terms of the observation results, anti-metro interference, and the influence on geomagnetic observations at the same station. The results show that the geo-resistivity measurement values by the two observation systems are similar. The geo-resistivity observation system by AC power supply has higher observation accuracy and better data quality. At the same time, the observation by the AC system has good anti-metro interference performance, and the power supply measurement will not cause interference to the geomagnetic observation operating at the same station. Through comparative analysis, it is beneficial to deepen the understanding of the observation system and various types of interference, and can also provide a reference for other electromagnetic observation stations.
2023,44（5）: 118-124 收稿日期：2022-08-29
DOI：10.3969/j.issn.1003-3246.2023.05.014
基金项目：四川省地震局地震科技专项（项目编号：LY2224）；中央级公益性科研院所基本科研业务费专项：地电阻率交直观测技术研究（现代化试点项目）
作者简介：李雪浩(1988-),男,工程师,主要从事地震监测工作。E-mail:cdtddgc@163.com
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