地铁电磁场对甚宽频带地震计观测的影响评估  

Evaluation of the Influence of Subway Electromagnetic Field on Very Broadband Seismometer Observations

作　　者：刘明辉[1] 李江[1] 林湛[1] 朱小毅[1] 周银兴[1] 崔仁胜[1] 马士振[2] LIU Minghui;LI Jiang;LIN Zhan;ZHU Xiaoyi;ZHOU Yinxing;CUI Rensheng;MA Shizhen(Institute of Earthquake Forecasting,CEA,Beijing 100036,China;Beijing Earthquake Agency,Beijing 100080,China)

机构地区：[1]中国地震局地震预测研究所,北京市100036 [2]北京市地震局,北京市100080

出　　处：《大地测量与地球动力学》2021年第10期1080-1084,共5页Journal of Geodesy and Geodynamics

基　　金：国家重点研发计划(2018YFC1503904-06,2018YFC1503904-07);现代化试点专项(2020IEF1205)。

摘　　要：在距离地铁3 km的地震观测台站安装2台相同型号的甚宽频带地震计,其中1台安装屏蔽罩,另外1台没有安装,通过计算连续24 h观测数据的加速度功率谱密度,评估地铁电磁场对甚宽频带地震计观测的影响。计算结果表明,地铁电磁场对甚宽频带地震计三分向的影响主要在10~1000 s频带范围内,其中受影响最大的是垂直分向,其次是水平分向。In this paper,two same type very broadband seismometers are installed in the seismic observation station three kilometers away from the subway.One is equipped with a shielding case,the other is not.By calculating the acceleration power spectrum density of continuous 24 hours observation data,we evaluate the influence of subway electromagnetic field on the observation of very broadband seismometer.The results show that the influence of subway electromagnetic field on the 3 components of the very broadband seismometer is mainly in the frequency band of 10 to 1000 s,affected mostly in the vertical direction,followed by the horizontal direction.

关 键 词：地铁磁场 甚宽频带地震计 磁屏蔽 背景噪声 

分 类 号：P315[天文地球—地震学]