GM4磁通门磁力仪观测数据预处理分析  

Data preprocessing and analysis of GM4 fluxgate magnetometer observations

作　　者：王秀敏[1] 畅国平[1] 王志敏[2] 张建国[3] WANG Xiumin;CHANG Guoping;WANG Zhimin;ZHANG Jianguo(Hongshan Benchmark Seismic Station,Hebei Earthquake Agency,Hebei Province 054000,China;Zhangjiakou Seismic Station,Hebei Earthquake Agency,Hebei Province 075001,China;Handan Seismic Station,Hebei Earthquake Agency,Hebei Province 056001,China)

机构地区：[1]河北省地震局红山基准地震台,河北054000 [2]河北省地震局张家口地震监测中心站,河北075001 [3]河北省地震局邯郸地震监测中心站,河北056001

出　　处：《地震地磁观测与研究》2021年第4期80-86,共7页Seismological and Geomagnetic Observation and Research

基　　金：中国地震局监测、预测、科研三结合课题(项目编号:3JH-170403)。

摘　　要：选取2017—2018年北京、昌黎、红山地震台GM4磁通门磁力仪观测资料,采用常规预处理方法,剔除地铁轻轨、地电阻率、高压直流输电对地磁观测数据的干扰,结果发现,经分转秒处理,数据出现缺记现象,且完整率多低于90%,而秒转分处理,数据完整率达100%,无缺记现象发生;采用小波变换方法,对受到地铁轻轨干扰的北京地震台地磁观测数据进行滤波处理,并与无地铁轻轨干扰的红山地震台地磁观测数据进行频谱对比分析,结果发现,小波变换方法可有效抑制地铁轻轨对GM4磁通门磁力仪观测的影响。The conventional preprocessing method is applied to the observation data of GM4 fluxgate magnetometer at Beijing,Changli,and Hongshan seismic stations from 2017 to 2018,to eliminate the interference data by subway light rail,georesistivity,and high voltage direct current transmission.The results show that after the conversion from minute-sampled data to secondsampled data,the integrity rate is mostly less than 90%;while the data integrity rate is 100%after the second-sampled data to minute-sampled data conversion.The geomagnetic observation data of Beijing Seismic Station disturbed by subway light rail are filtered by the wavelet transform method and the spectrum of the processed data are compared with that of the geomagnetic observation data of Hongshan Seismic Station without subway light rail interference.The results show that the wavelet transform method can effectively suppress the influence of subway light rail on the observation of GM4 fluxgate magnetometer.

关 键 词：GM4磁通门磁力仪 预处理方法 地铁干扰 小波变换 干扰抑制 

分 类 号：P315.63[天文地球—地震学]