基于快速傅里叶变换的恩施地震监测中心站地磁干扰分析处理  

Analysis and Processing of Geomagnetic Interference at Enshi Earthquake Monitoring Center Station Based on FFT

作　　者：胡苗 周诗 王建伟 Hu Miao;Zhou Shi;Wang Jianwei(Hubei Key Laboratory of Earthquake Early Warning,Hubei Earthquake Agency,Wuhan,China;Enshi Earthquake Monitoring Center Station,Enshi,China)

机构地区：[1]湖北省地震局,地震预警湖北省重点实验室,湖北武汉 [2]恩施地震监测中心站,湖北恩施

出　　处：《科学技术创新》2025年第5期93-96,共4页Scientific and Technological Innovation

基　　金：湖北省地震局基础科研基金项目(2022HBJJ002)。

摘　　要：本文通过傅里叶变换,将受干扰的地磁相对观测值由时间域变换到频率域,进行相关频谱分析,并试验最佳截止频率进行滤波处理,最后通过傅里叶逆变换将处理后的频域信号转换为时域信号,最终实现对离散地磁数据的平滑处理。结果表明:恩施地震监测中心站GM4与FGM01两套地磁观测仪器观测数据一致,仪器测量数据可靠;典型干扰类型主要为台站周边施工引起的大量密集尖峰、台阶状高频干扰;对于尖峰与小台阶施工干扰,采用高端截止频率为0.001 Hz的低通滤波器,对高压直流干扰,采用高端截止频率为0.0001 Hz的低通滤波器,既能消除干扰,又能最大程度地保持原始曲线形态。The typical interference are mainly a large number of dense peaks and stepped high-frequency interference caused by construction around Enshi Earthquake Monitoring Center Station;For construction interference caused by spikes and small steps,a low-pass filter with a high-end cutoff frequency of 0.001 Hz is used,which can eliminate interference and maintain the original curve shape to the greatest extent possible.

关 键 词：地磁数据滤波 快速傅里叶变换 干扰分析 

分 类 号：P315[天文地球—地震学]