在地电阻率观测过程中，观测系统不稳定或环境干扰常导致地电阻率测量值出现超差现象。采集测量电极M、N之间自然电位差的秒数据，绘制并分析这些数据的供电波形及特征，通过电压采集仪接入观测系统，监控同时段自然电位差来快速识别地电阻率超差现象，并探讨引起超差的原因。结果发现，超差分别由地电外线路中断、地铁运行干扰、观测主机工作不稳定等因素造成。
In the process of geoelectrical resistivity observation, the instability of observation system or environmental interference often leads to outliers in geoelectrical resistivity measurements. By collecting second data of the natural potential difference between the measurement electrodes M and N, and drawing and analyzing the power supply waveforms and characteristics of this data, a voltage collector is integrated into the observation system. This enables the rapid identification of geoelectrical resistivity outliers by monitoring the natural potential difference over the same period, and the reasons for these outliers are explored. The results show that the outliers are caused by factors such as interruption in the geoelectrical external line, interference from subway operation, and instability in the operation of the observation host.
2023,44（4）: 57-62 收稿日期：2021-11-16
DOI：10.3969/j.issn.1003-3246.2023.04.009
基金项目：河南省地震局第三期科技创新团队项目
作者简介：郅红魁(1974-),男,高级工程师,主要从事地震前兆分析、处理、地震监测预报研究工作。E-mail:zhkwhx@163.com
参考文献：
何世根. 地电观测技术[M]. 北京:地震出版社,2000.
张国清. 减少干扰时间提高地电阻率观测精度[J]. 地震地磁观测与研究,2009,30(Z1):115-119.
中国地震局. 地震及前兆数字观测技术规范:电磁观测[S]. 北京:地震出版社,2001.
