不同深度布设台站的噪声及信号幅值特征分析  

Amplitude characteristic analysis of noise and signal from the stations deployed at different depths

作　　者：张阿瑶 范广超[1] 王敏超[1] 沈旭峰[1] 张诚鎏[1] 卢娜 崔甲甲[1] Zhang Ayao;Fan Guangchao;Wang Minchao;Shen Xufeng;Zhang Chengliu;Lu Na;Cui Jiajia(Northwest Institute of Nuclear Technology,Xi＇an 710024,China)

机构地区：[1]西北核技术研究所,中国西安710024

出　　处：《地震学报》2018年第4期440-447,共8页Acta Seismologica Sinica

基　　金：国家自然科学基金项目(41474035)资助

摘　　要：为探究地震观测中地震计检测到的噪声和信号强度均受其布设深度的影响,本文首先对CPUP和LPAZ两台站布设的不同深度地震计所得到的数据进行噪声水平和地震信号对比;其次采用对比功率谱密度的方法对两台站不同通道采集到的不同时段的噪声数据进行分析;最后比较两台站不同通道采集到的整月数据的噪声幅值、信号幅值、信噪比特征。结果显示:深度较大的通道,其噪声功率均值较小;当事件信号到来时,较深通道的地震计检测到的信号和噪声幅值比较浅通道均有所减小,在信号和噪声幅值均减小的共同影响下,信噪比有一定程度的变化,其中LPAZ台站的信噪比提高较为明显。In seismological observations,the detected noise and signal strength are affected by the depth of seismometer. The data obtained from CPUP and LPAZ,two different stations with two channels at different depths,show different levels of noise and seismic signals. In this paper,we mainly investigate the noise of the two stations by contrasting the noise power spectral density of different channels over different time periods,and the seismic signals by comparing the noise and signal amplitude and signal noise ratio of the two stations. The results show that the channels with larger depths have smaller average noise power. Furthermore,when the seismic waves arrive,the noise and signal amplitudes detected by the seismometers in the deeper channels have been reduced compared with the seismometer in the shallow channels,and on this situation the signal noise ratio changed to a certain degree,and is improved more obviously for the station LPAZ.

关 键 词：地震观测 深井台站 噪声 信号特征 

分 类 号：P315.63[天文地球—地震学]