北京测震台网台基背景噪声特征  

Background Noise Characteristics of Beijing Seismic Network

作　　者：侯颉[1,3] 余大新 叶庆东[1] 徐荟[3] 孟宪纲[1] 徐东卓[1] 张海春[2] HOU Jie;YU Daxin;YE Qingdong;XU Hui;MENG Xiangang;XU Dongzhuo;ZHANG Haichun(The First Crust Monitoring and Application Center,CEA,Tianjin 300180,China;Beijing Earthquake Agency,CEA,Beijing 100080,China;Institute of Geophysics,CEA,Beijing 100081,China)

机构地区：[1]中国地震局第一监测中心,天津300180 [2]北京市地震局,北京100080 [3]中国地震局地球物理研究所,北京100081

出　　处：《华北地震科学》2019年第3期56-61,80,共7页North China Earthquake Sciences

基　　金：北京市地震监测台网规划设计项目;三门峡地区流动地震台阵观测与研究项目(201811)

摘　　要：利用Welch算法,选取北京市测震台网28个测震台站地震连续波形中不同时段的无震记录,计算其台基噪声功率谱并进行背景噪声特征的统计分析,结果表明:北京市测震台网各台基噪声背景优势频率各有特征,高低频段噪声功率谱曲线差异大。在1~20Hz频段内,北京地区的背景噪声高值区出现在中心城区附近,低值区出现在北部的琉璃庙、密云和南部的上方山等台站,主要受人为噪声影响;在0.008~0.1Hz频段内,北京所有地区差异不大。Using the Welch algorithm, the different time periods’ earthquake-free records of the continuous three-component seismometer waveform of 28 seismic stations in Beijing Seismic Network were selected, the power spectrum density of the base-based noise was calculated and statistically analyzed.The results show that the dominant frequency of each base noise background of Beijing Seismic Network has its own characteristics, and the difference between the high and low frequency noise power spectrum curves is large.In the 1~20 Hz frequency band, the high value area of the background noise value in Beijing appears near the central city, and the low value area appears in Liulimiao and Miyun in the north, and Shangfangshan in the south, which is mainly affected by man-made noise.In the frequency range of 0.008~0.1 Hz, there is little difference in all areas of Beijing.

关 键 词：北京测震台网 数字台站 背景噪声 功率谱密度 

分 类 号：P315.31[天文地球—地震学]