承德地球物理台网地磁观测环境干扰

近年来,承德地球物理台网观测数据受到高压直流输电和车辆等场地环境干扰。以承德和丰宁地震台FHD-2B质子矢量磁力仪观测数据为基础,从影响分量、多台站对比、查询方式等识别干扰源,分析2种影响因素的特点,结果显示:①高压直流输电主要影响垂直分量Z;车辆干扰时,磁偏角D、垂直分量Z、水平分量H均可能受到影响;②高压直流输电会影响沿线多个台站,且曲线畸变在时间上具有同步性;车辆干扰一般只影响附近单个台站;③高压直流输电影响可在国家地磁台网中心网站查询;车辆干扰可通过查看监控、询问门卫、每日巡查场地等方式核实。

Environmental interference of geomagnetic observation in Chengde geophysical network

In recent years, the observation data of chengde geophysical network are interfered by HVDC transmission and vehicle. Based on the observation data of FHD-2B proton vector magnetometer at Chengde and Fengning seismic stations, interference sources are identified from the influence component, comparison of multiple stations and query method, and the characteristics of the two influencing factors are analyzed. The results show that:① HVDC transmission mainly affects vertical component Z; when vehicles interfere, the magnetic declination D, vertical component Z, and horizontal component H may all be affected;② HVDC transmission will affect several stations along the line, and the curve distortion is synchronous in time; Vehicle interference usually affects only a single nearby station;③The influence of HVDC transmission can be found on the website of National Geomagnetic Network Center; Vehicle interference can be verified by checking the monitoring, asking the doorman, daily site inspection, etc.