摘要
面波频谱分析法(SASW)作为一种横向分辨率较高的瑞雷面波勘探方法,由于计算得到的基阶面波频散曲线存在较大误差以及无法获得高阶模式频散曲线而在应用中受到限制.通过应用Fourier变换方法(FT法)分离提取面波各模态数据,进而对分离后的各模态数据利用SASW法计算频散曲线.通过模型实例分析得出:(1)利用SASW计算基阶面波频散曲线时必须分离得到基阶面波数据,然后计算才能得到正确的结果;(2)基于多模态分离的SASW法可以计算得到面波高阶模式的频散曲线.
Spectrum analysis of surface wave （SASW） is one of the Rayleigh wave exploration methods with higher lateral resolution. Presently, there is a large error in calculating fundamental mode dispersion curve of the Rayleigh wave and the dispersion curve of the higher mode can＇t be calculated by the SASW method. As a result, it is limited in its application. In this paper, different modes of Rayleigh wave are separated and extracted by Fourier transform （FT method）, and then, the dispersion curve will be calculated by the SASW method using the Rayleigh wave data after the separation. According to the analysis of examples, it can be concluded that： （1） when using the SASW method to calculate the fundamental mode dispersion curve, the Rayleigh wave data of fundamental mode should be separated first, and then calculated. Or else, the fundamental mode dispersion curve couldn＇t be right; （2） it can get higher mode dispersion curve by the SASW method based on multi-mode separation.
出处
《地球科学（中国地质大学学报）》
EI
CAS
CSCD
北大核心
2009年第6期1012-1018,共7页
Earth Science-Journal of China University of Geosciences
基金
国家重点基础研究发展计划(973计划)"南海深水区复杂地质结构地震采集基础理论研究2009CB219403"
