Short-Time Fourier Transform and Generalized S Transformation are Used of Extracting Rayleigh-Wave Dispersion Curves
详细信息
- 责任者：Yuan Wei (Key Lab. of Geophysical Prospecting and Information Technology ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Zhou Hongsheng
- 刊名：Computing Techniques for Geophysical and Geochemical Exploration
- 出版年：2013
- 卷期：35(1)
- 关键词：瑞雷波法 ; Rayleigh wave methods ; 波频散 ; wave dispersion
- 页码：p.54-59
- 图表：illus., 15 refs.
- 分类号：1600
- issnNo：ISSN1001-1749
- isbnNo：CN51-1242/P
摘要
Rayleigh wave exploration as a non-destructive in situ detection method has been increasingly used in geotechnical engineering testing and environmental engineering.Extraction of dispersion curves is an important step in the surface wave velocity.This will be short-time Fourier transform and the generalized S transform two linear time-frequency analysis method for Rayleigh wave dispersion curve extraction.According to the analysis of the theoretical model and real seismic data,it is concluded that:①Short-time Fourier transform only {or shallow high-frequency part of the energy of strong Rayleigh wave dispersion curve extraction is better,while the low-frequency energy extraction is the weaker part of the poor.②Generalized S transform λ and p by the introduction of two parameters to the signal frequency according to the level of automatic mediation shape and size of the window function,with multi-resolution features,so while the high and low frequency of the Rayleigh wave signal better treatment effect,and thus help to improve the exploration depth of the Rayleigh wave.