四分量钻孔应变干扰特征时频域研究  

Time-frequency Domain Study on Interference Characteristics of Four-component Borehole Strain

作　　者：冯凯宇 窦立婷 李晨 任力伟[1,2] 成诚 丁学文[1,2] FENG Kai-yu;DOU Li-ting;LI Chen;REN Li-wei;CHENG Cheng;DING Xue-wen(Shanxi Earthquake Agency, Taiyuan, Shanxi 030021, China;National Continental Rift Valley Dynamics Observatory of Taiyuan, Taiyuan, Shanxi 030025, China)

机构地区：[1]山西省地震局,山西太原030021 [2]太原大陆裂谷动力学国家野外科学观测研究站,山西太原030025

出　　处：《山西地震》2022年第1期21-27,共7页Earthquake Research in Shanxi

基　　金：山西省地震局科研项目(SBK-2006)。

摘　　要：时频分析是分析应变数据的主要方法,采用小波变换和S变换,对山西代县和繁峙地震台的四分量钻孔应变仪受雷电、大风干扰的观测数据进行时频分析。结果发现,通过秒采样数据时频谱来识别雷电信号的能力优于分钟值数据,分钟值数据时频特征用来反应大风干扰信号的能力优于秒值数据;S变换在高、低频部分的时间分辨率均优于小波变换。通过小波变换及S变换对两个地震同震响应时频谱的对比研究,得出四分量钻孔应变仪秒值数据的时频谱对同震信号分辨能力优于分钟值数据。Time-frequency analysis is the main method to analyze strain data.Time-frequency analysis of lightning and gale interference observed data of four-component borehole strain gauge in Daixian Seismic Station,Shanxi Province and Fanshi Seismic Station,Shanxi Province are carried out by wavelet transform and S-transform.It is found that the time-frequency characteristic of the minute value data is better than that of the minute value data in identifying lightning signal,and the time-frequency characteristic of the minute value data is better than that of the second value data.The time resolution of S-transform in high and low frequency parts is better than that of the wavelet transform.Through the comparative study of the coseismic response time-frequency spectra of the two earthquakes by wavelet transform and S-transform,it is concluded that the resolution of the time-frequency spectrum of the second value data of the four-component borehole strain gauge to the coseismic signal is better than that of the minute value data.

关 键 词：四分量钻孔应变 时频分析 干扰特征 

分 类 号：P315.725[天文地球—地震学]