| 地铁电磁场对甚宽频带地震计观测的影响评估 |
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| 引用本文： | 刘明辉,李江,林湛,朱小毅,周银兴,崔仁胜,马士振.地铁电磁场对甚宽频带地震计观测的影响评估[J].大地测量与地球动力学,2021,41(10):1080-1084. |
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| 作者姓名： | 刘明辉 李江 林湛 朱小毅 周银兴 崔仁胜 马士振 |
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| 作者单位： | 中国地震局地震预测研究所,北京市复兴路63号,100036;北京市地震局,北京市苏州街28号,100080 |
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| 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10~1 000 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。
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| 关 键 词： | 地铁磁场 甚宽频带地震计 磁屏蔽 背景噪声 |
Evaluation of the Influence of Subway Electromagnetic Field on Very Broadband Seismometer Observations |
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| LIU Minghui,LI Jiang,LIN Zhan,ZHU Xiaoyi,ZHOU Yinxing,CUI Rensheng,MA Shizhen.Evaluation of the Influence of Subway Electromagnetic Field on Very Broadband Seismometer Observations[J].Journal of Geodesy and Geodynamics,2021,41(10):1080-1084. |
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| Authors: | LIU Minghui LI Jiang LIN Zhan ZHU Xiaoyi ZHOU Yinxing CUI Rensheng MA Shizhen |
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| Abstract: | 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 1 000 s, affected mostly in the vertical direction, followed by the horizontal direction. |
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| Keywords: | metro electro-magnetic field very broadband seismometer magnetic shield background noise |
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