洛阳地震台地电场观测系统防雷改造期间数据干扰分析

2018年洛阳地震台观测技术保障系统升级改造,地电场观测系统短极距NS、NE测道数据出现大幅度阶跃变化,其中NS测道变化达-420 mV/km,NE测道变化达-290mV/km。通过走访调查地电场观测环境,巡检测试观测系统,并核实、分析观测技术保障系统,发现本次数据变化非地震地球物理异常,应为电源防雷插排漏电及机柜内接地线未明确分类所导致的干扰。

Analysis of data interference during lightning protection reconstruction of the geoelectric field observation system at Luoyang Seismic Station

During the upgrade of the observation technology support system of the Luoyang Seismic Station in 2018, the short polar-distance NS and NE observation item data of the geoelectric field observation system showed large step changes. Among them, the range of NS observation item data reaches -420 mV/km, and the range of NE observation item data reaches -290 mV/km. In the paper, through the investigation of the geoelectric field observation environment, combined with the inspection of the observation system and analysis of the observation technology support system, it is found that this data change is not an earthquake geophysical anomaly, the interference should be caused by the power leakage of lightning protection socket and the ground wire in the cabinet that cannot be clearly classified.