地震学报2012，Vol.34Issue(6)：830-840,11.DOI:10.3969/j.issn.0253-3782.2012.06.009
S变换在面波去噪中的应用
Application of S transform in surface wave denoising
摘要
Abstract
S transform is a time-frequency transformation method used to analyze non-stationary signals, and it can depict the time-frequency characteristics of seismic signals very well. In this paper, S transform is used to remove noises in seismic surface wave data. The theoretical basis of S transform is introduced first, and then time-frequency filter and threshold filter are designed for processing ambient noise data and surface wave data of natural earthquakes, respectively. The results show that the short period part of group velocity dispersion curve of surface wave data is improved after S transform denoising, and the group velocity can be tracked continuously to about 6 s, but the long period part is missing. The effect of S transform is better than that of phase match filter (PMF) , and the combination of the two will get more ideal results.关键词
S变换/时频滤波/阈值滤波/频散曲线/相位匹配滤波Key words
S transform/ time-frequency filter/ threshold filter/ dispersion curves/ phase match filter分类
天文与地球科学引用本文复制引用
李玲利,王清东,沈文渊,朱良保..S变换在面波去噪中的应用[J].地震学报,2012,34(6):830-840,11.基金项目
国家自然科学基金(40774018)和中央高校基本科研业务费专项资金资助. （40774018）
