宁夏陶乐、灵武井下地震观测站背景噪声分析  

Background noise analysis of Taole and Lingwu underground seismic observation stations in Ningxia

作　　者：唐浩 马瑞 何秋菊[1] 胡子琪 李青梅[1] 袁媛 TANG Hao;MA Rui;HE Qiuju;HU Ziqi;LI Qingmei;YUAN Yuan(Earthquake Agency of Ningxia Hui Autonomous Region,Yinchuan 750001,China)

机构地区：[1]宁夏回族自治区地震局,中国银川750001

出　　处：《地震地磁观测与研究》2022年第5期86-93,共8页Seismological and Geomagnetic Observation and Research

基　　金：宁夏自然科学基金(项目编号:2022AAC03689);宁夏地震科研基金(项目编号:NX202002)。

摘　　要：地震台站背景噪声是影响地震观测质量的主要因素之一,分析背景噪声随频率的分布对于地震观测具有重要意义。通过宁夏陶乐、灵武井下地震观测站地表背景噪声记录,对比分析二者原始地动波形差异及其频谱特征,计算观测站背景噪声功率谱密度PSD值及三分向1—20 Hz各倍频程带宽平均噪声RMS值,分析井下与地表背景噪声PSD值、RMS值差异及变化特征。结果表明,同一观测站,井下地震计平均噪声RMS值比地表小10倍左右;对比分析陶乐、灵武井下地震观测站地表平均噪声RMS值,二者相差不大,但对比井下平均噪声RMS值发现,灵武井下地震观测站平均噪声RMS值较大。The background noise of seismic stations is one of the main factors affecting the quality of seismic observations.Analyzing the distribution of background noise with frequency is of great significance for seismic observation.Based on the ground surface background noise records of the Ningxia Taole and Lingwu underground seismic observation stations,this study compares and analyzes the differences and spectral characteristics of the original ground motion waveforms of the two stations,calculates the PSD values of the background noise of the observation station and the RMS values of average noisefor each octave band of 1-20 Hz forthe three-component observations,and analyzes the difference and variation characteristics of the PSD value and RMS value of the background noise between the undergroundand the surface observations.The results show that at the same observation station,the average noise RMS values of the downhole seismometer is about 10 times smaller than that of the surface.Comparing and analyzing the average noise RMS values of Taole and Lingwu underground seismic observation stations show that the difference between the two is not significant.However,comparing the RMS values of the average downhole noise,it is found that the RMS values of the average noise of the Lingwu underground seismic observation station are relatively larger.

关 键 词：背景噪声 频谱 功率谱密度 RMS 对比分析 

分 类 号：P315.7[天文地球—地震学]