翁田台地电场观测受干扰的因素分析

Analysis of factors affecting the disturbance of geoelectric field observation at Wengtian station

海南省文昌翁田台地电场数据质量自2019年3月开始下降,地电场数据质量下降主要表现为日相关系数偏低、北南向长极距与短极距数据曲线呈反向变化、绝缘度趋向于零等情况。2019年3月—2020年10月,我们分别对观测室装置系统、室外外线路、连接口等逐一进行详细的排查工作和电极、电缆的对比实验工作,最终确定影响因素为电极故障和电缆线破损造成绝缘度下降。并在2020年10月进行了电缆线改造。2020年11月开始翁田台地电场数据质量回升,日相关系数恢复至0.8以上、六测道数据曲线变化一致和外线路绝缘度恢复至150 MΩ以上。经过此次翁田台地电场数据受干扰因素的排查,得出一些经验方法,希望给其他安装地电场仪器的台站提供借鉴。

The quality of the geoelectric field data of Wenchang Wengtian station in Hainan Province has been declining since March 2019. The quality of the geoelectric field data has declined mainly due to the low daily correlation coefficient,the reverse change of the north-south long pole distance and short pole distance data curves,and the degree of insulation tends to a zero-level situation. From March 2019 to October 2020,we carried out detailed investigations and comparison experiments of electrodes and cables on the observation room installation system,outdoor and external lines,connection ports,etc.,and carried out renovation of the cable line in October 2020. Starting from November2020,the quality of the electric field data of the Wengtian station has recovered,the daily line relationship number has recovered to more than 0.8,the data curves of the six measurement channels have changed the same,and the insulation of the external line has recovered to more than 150 MΩ. After the experience of investigating the interference factors of the electric field data of Wengtian station,some methods have been obtained,hoping to serve as a reference for other stations that have installed geoelectric field instruments.