额肯呼都格地震台地震观测波形干扰分析  

Seismic waveform interference analysis at Ekenhuduge Seismic Station

作　　者：包文超 赵铁锁[1] 郭雷 郭晔 王西 BAO Wenchao;ZHAO Tiesuo;GUO Lei;GUO Ye;WANG Xi(Earthquake Agency of the Nei Monggol Autonomous Region,Hohhot 010010,China;Xilinhot Earthquake Monitoring Center Station,the Nei Monggol Autonomous Region 026000,China)

机构地区：[1]内蒙古自治区地震局,呼和浩特010010 [2]锡林浩特地震监测中心站,内蒙古自治区026000

出　　处：《地震地磁观测与研究》2024年第3期94-99,共6页Seismological and Geomagnetic Observation and Research

基　　金：内蒙古自治区地震局局长基金(项目编号:2022JC15);中国地震局地震监测、预报、科研三结合课题(项目编号:3JH-202301031)。

摘　　要：计算额肯呼都格地震台测震和强震连续观测数据背景噪声,对地震观测数据PDF进行分析,发现强震观测数据存在异常干扰。对受干扰数据进行噪声功率谱(Power Spectral Density,PSD)、噪声功率谱概率密度(Probability Density Function,PDF)分析,缩小干扰源范围,并进行现场排查,判定强震观测数据异常由电源干扰所致。将市电断开后,观测数据恢复正常。清理数据采集器和强震计接地线,并更换线缆,重新供电后观测数据噪声明显降低,再次计算数据PDF并进行傅里叶变换,结果均无异常。After calculating the background noise of seismic measurement and strong earthquake continuous observation data at Ekenhuduge Seismic Station,and analyzing the Power Spectral Density(PDF)of seismic observation data,we found there were seismic waveform interference.Power Spectral Density(PSD)and Probability Density Function(PDF)of the disturbed data were analyzed to narrow down the range of interference sources and conduct on-site investigation.It is concluded that the anomaly of strong earthquake observation data is caused by power interference.As soon as the mains disconnected,the data returns to normal.After cleaning the ground wires of the data collector and the strong seismic gauge,replacing the cables,and re-powering the power supply,data noise was significantly reduced.We calculated the PDF again and performed Fourier transform,the results were all normal.

关 键 词：地震波形干扰 电源干扰 傅里叶变换 PDF 

分 类 号：P315.7[天文地球—地震学]