基于Fourier变换的瑞雷面波分离提取及实例分析

来源期刊:中南大学学报(自然科学版)2010年第2期

论文作者:张大洲 熊章强 秦臻

文章页码:643 - 648

关键词:瑞雷面波;Fourier变换;τ-p变换;面波提取中图分类号:P631 文献标志码:A

Key words:Rayleigh wave; Fourier transform; τ-p transform; Rayleigh wave extraction

摘    要:应用Fourier变换法分离提取地震记录中不同模态的瑞雷面波,其原理是:利用瑞雷面波各模式传播速度的差异,将时间域中叠加在一起的瑞雷面波信号在频率波数域中分开,以此实现分离提取各阶模态瑞雷面波。研究结果表明:τ-p变换只能提取浅部能量较强的部分瑞雷面波,不能提取瑞雷面波的全部频散成分且不能使不同模态瑞雷面波分离;利用Fourier变换可以准确分离提取不同模态的瑞雷面波,且经分离后计算所得频散曲线的频带宽度扩展,有利于提高瑞雷面波勘探的能力。

Abstract: Fourier transform was adopted to separate and extract different modes of Rayleigh wave from the seismic data. Based on the fact that the different modes of Rayleigh wave have different propagation velocities, the signals of Rayleigh wave which superposes in time domain can be separated in frequency-wave-number domain, different modes of Rayleigh wave are separated and extracted by Fourier transform. The results show that τ-p transform can only extract part of Rayleigh wave with strong energy in shallow surface, while it can’t completely extract all the dispersion component and separate different modes of Rayleigh wave. Fourier transform can exactly separate and extract different modes of Rayleigh wave. Moreover, the bandwidth of dispersion curve calculated with separate data is extended, which is beneficial for improving the capability of the Rayleigh wave exploration.

基金信息:“十一五”国家科技支撑项目

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