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-290 mV/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。
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.
2020,41(2): 146-154 收稿日期:2019-08-26
DOI:10.3969/j.issn.1003-3246.2020.02.017
基金项目:中国地震局震情跟踪青年项目(项目编号:2020010412);中国地震局监测预报科研三结合课题(项目编号:3JH-202002019)
作者简介:谢佳兴(1995-),男,本科,陕西宝鸡人,2016年参加工作,主要从事地震地球物理观测仪器运维工作。E-mail:411043515@qq.com
参考文献:
艾萨·伊斯马伊力,邱大琼.新疆于田县2014年MS7.3级地震前和田地震台前兆资料异常分析[J]. 高原地震,2016,28(3):9-13.
罗娜,乔子云,寇海川,等. 河北省地电场干扰因素分析[J]. 地震地磁观测与研究,2016,37(6):60-67.
李雪浩,刘华姣,赵乃千,等. 成都地震台地电场观测干扰因素分析[J]. 四川地震,2018,(2):13-18.
席继楼. 地电场观测方法与观测技术研究[J]. 地震地磁观测与研究,2019,40(2):1-20.
席继楼,赵家骝,关韵莹,等. 地电场观测中的工频干扰抑制方法研究[J].地震,2015,35(4):53-63.