海拉尔台阵数据功率谱分析  

Analysis of the Array Data Power Spectrum in Hailar

作　　者：白永福[1] 高翔 张伟[1] 奚冲霄[1] 王凌 BAI Yong-fu;GAO Xiang;ZHANG Wei;XI Chong-xiao;WANG Ling(Beijing Earthquake Agency,Beijing 100080,China)

机构地区：[1]北京市地震局,北京100080

出　　处：《防灾减灾学报》2020年第2期49-55,共7页Journal of Disaster Prevention And Reduction

摘　　要：通过对海拉尔台阵数据应用Welch算法进行功率谱计算,研究背景噪声水平。功率谱分析结果表明,夜间和白天的背景噪声水平存在差异,在2.5Hz频段上白天与夜间平均值相差8d B,这与人们的作息时间有关,通过白天与夜间的连续性观察对比发现功率谱曲线变化分别在0.02Hz、0.2Hz、1Hz、2.5Hz、6.5Hz频段上的变化存在明显的一致性。对于功率谱分析中发现的单频率脉冲经过核实证明为宝日希勒煤矿定期开采所导致。海拉尔台阵噪声谱均处于全球噪声的标准曲线之间,且明显偏向于低噪声一侧曲线,平均低于噪声曲线高值30d B,人为噪声基本不影响背景噪声水平的变化,观测点噪声水平低,台阵背景噪声符合并优于地震观测对背景噪声的要求,监测能力满足监测需求。The power spectrum is calculated by applying Welch algorithm to the Hailar array data,and the background noise level is studied.The power spectrum analysis results show that the nighttime and daytime background noise level differences in the 2.5 Hz band during the day and night average value is8 dB,which is related to people’s daily schedule,by day and night continuous observation comparison curve of power spectrum changes in 0.02 Hz and 0.2 Hz,respectively 1 Hz,2.5 Hz,6.5 Hz band the existence of obvious consistency.The power spectrum analysis found in the single frequency pulse after verification for Baorixile coal mining caused regularly.Hailar array noise spectrum are in the standard curve of global noise,and obvious bias in the low noise side curve is lower than the average value of30 dB curve of high noise.The man-made noise does not affect the basic change of background noise level.The observation noise level is low.The array of background noise with better match the requirements of seismic observation of background noise monitoring,which ability to meet the needs of monitoring.

关 键 词：海拉尔 数据质量 css文件 功率谱 噪声源 台阵 

分 类 号：P315.63[天文地球—地震学]