广东地震预警网三类站环境地噪声水平评估  

Assessment of Ambient Ground Noise Levels at Three Types of Stations of Guangdong Earthquake Early Warning Network

作　　者：陈建涛[1,2,3] 叶世山 李晋恺[1,2,3] 卢子晋 严兴 劳谦[1,2,3] 丁莉莎 黄晖[1,2,3] CHEN Jiantao;YE Shishan;LI Jinkai;LU Zijin;YAN Xing;LAO Qian;DING Lisha;HUANG Hui(Guangdong Earthquake Agency,Guangzhou 510070,China;Key Laboratory of Earthquake Monitoring and Disaster Mitigation Technology,CEA,Guangzhou 510070,China;Key Laboratory of Earthquake Early Warning and Safety Diagnosis of Major Project,Guangzhou 510070,China)

机构地区：[1]广东省地震局,广州510070 [2]中国地震局地震监测与减灾技术重点实验室,广州510070 [3]广东省地震预警与重大工程安全诊断重点实验室,广州510070

出　　处：《华南地震》2024年第3期137-145,共9页South China Journal of Seismology

基　　金：广东省地震局青年地震科研基金(重点实验室开放基金)(GDDZZ202301);广东省地震局科研项目(GDDZJ202201)联合资助。

摘　　要：对广东地震预警网71个基准站、201个基本站、900个一般站进行环境地噪声计算,整体评估结果良好,符合国家规范观测要求,具体为:基准站测震通道噪声水平位于NHNM和NLNM之间,远低于M1.5振幅谱模型,RMS值集中于10^(-9)至10^(-8) m/s数量级,65个I级基准站评定为优质台站;基准站强震通道噪声水平普遍都低于M1.5,接近NHNM,RMS值集中于10^(-7)~10^(-6) m/s^(2)数量级;基本站噪声水平普遍都低于M2.5,RMS值集中于10^(-6)~10^(-5) m/s^(2)数量级;一般站噪声水平低于M3.5,RMS值集中于10^(-4) m/s^(2)数量级。大部分一般站、部分基准站强震通道和少量基本站,其噪声主要体现出来的是仪器固有自噪声,如应用于背景噪声互相关分析研究是无意义的。此外,一般站普遍存在垂直分量噪声显著高于水平分量(大约高出0.5倍),这是烈度仪性能引起的。Ambient ground noise calculations were performed for 71 reference stations,201 strong motion stations,and 900 intensity stations of Guangdong Earthquake Early Warning(EEW)Network.The overall assessment was favorable,meeting national observational standards.Specifically,noise levels from the seismic channels of the reference stations fell between NHNM and NLNM,significantly lower than the M1.5 amplitude spectrum models,with RMS values primarily in the order of magnitudes of 10^(-9)-10^(-8) m/s.In addition,65 reference stations at level I were assessed as high-quality stations.The noise levels from strong seismic channels of the reference stations was generally lower than the M1.5,approaching NHNM,with RMS values primarily in the order of magnitudes of 10^(-7)-10^(-6) m/s^(2).The noise levels of strong motion stations were generally lower than the M2.5,with RMS values primarily in the order of magnitudes of 10^(-6)-10^(-5) m/s^(2).The noise levels of intensity stations were lower than the M3.5,with RMS values mainly in the order of magnitude of 10^(-4) m/s^(2).In most intensity stations,strong seismic channels of some reference stations,and a few strong motion stations,the ambient noise mainly reflects the inherent self-noise of intensity meters or accelerometers,which was meaningless for cross-correlation analysis of background noise.Additionally,the vertical component noise of intensity stations was significantly louder than the horizontal component noise(by approximately 0.5 times)due to the performance of intensity meters.

关 键 词：地震预警 基准站 基本站 一般站 环境地噪声 

分 类 号：P315.62[天文地球—地震学]