大同站FHD-2B地磁观测数据典型干扰分析  

Typical interference analysis of FHD-2B observation data at Datong seismic station

作　　者：郝雪景 韩胜[1,2] 高龙飞 刘炜 Hao Xuejing;Han Sheng;Gao Longfei;Liu Wei(Shanxi Earthquake Agency,Shanxi Taiyuan 030021,China;National Continental Rift Valley Dynamics Observatory of Taiyuan,Shanxi Taiyuan 030025,China)

机构地区：[1]山西省地震局,山西太原030021 [2]太原大陆裂谷动力学国家野外科学观测研究站,山西太原030025

出　　处：《地震科学进展》2023年第6期251-260,共10页Progress in Earthquake Sciences

基　　金：山西省地震局科研项目(SBK-2009);中国地震局地质研究所国家野外科学观测研究站课题(NORSTY20-05)联合资助

摘　　要：山西省大同地震监测中心站FHD-2B地磁观测数据质量主要受仪器自身观测系统和周围环境干扰影响,由于仪器出厂后性能接近稳定,因此要提高观测数据质量,可以从改善环境干扰入手。本文从连续率、完整率和背景噪声3个方面对2017—2021年的观测数据进行质量评价,发现自2019年6月仪器更新改造后,仪器背景噪声水平明显降低。通过分析场地施工、车辆运行、高压直流输电、断电等典型干扰事件下的数据曲线形态,发现施工干扰一般表现为各分量受干扰时段一致,干扰幅度不同;高压直流输电干扰常表现为Z分量干扰严重,可以通过国家地磁台网中心给出的干扰时段,结合周边地磁台站数据进行处理;车辆干扰对数据各分量均产生干扰,对应于车辆活动时段;断电干扰表现为D、H、Z分量观测数据曲线变粗,毛刺增多,甚至出现错误数据,通过修改仪器参数解决。总结不同干扰曲线特征,便于工作人员正确使用FHD-2B地磁数据进行地震研究。The geomagnetic observation data of FHD-2B at Datong seismic station in Shanxi is mainly affected by the interference of the instrument’s own observation system and the surrounding environment.Since the performance of the instrument is nearly stable after delivery,we can improve the quality of observation data by improving the environment.In this paper,the quality of observation data from 2017 to 2021 was evaluated from three aspects:continuity rate,integrity rate and background noise,and it is found that the background noise level of the instrument has been significantly reduced since the instrument was updated in June 2019.By analyzing the data curves of different interferences such as construction interference,vehicle interference,high-voltage direct current transmission interference and power failure,it is found that the construction interference is generally manifested in the same period of time when each component is interfered,and the interference amplitude is different;the interference of high-voltage direct current transmission is usually serious in Z component,which can be processed through the interference period given by the National Geomagnetic Network Center and combined with the data of surrounding geomagnetic stations;vehicle interference interferes with each component of data,corresponding to vehicle activity period;the power failure interference shows that the observed data curves of D,H and Z components become thicker,burrs increase,and even wrong data appear,which can be solved by modifying the parameters of the instrument home page.The characteristics of different interference curves are summarized,which is convenient for workers to use FHD-2B geomagnetic data correctly for seismic research.

关 键 词：FHD-2B 地磁 质量评价 干扰 大同 

分 类 号：P315.63[天文地球—地震学]