Rayleigh wave velocity analysis in pan f-k domain

Rayleigh wave survey is an important method to solve the near-surface geological problems,and an important technical aspect of this method is the extraction of the Rayleigh wave phase velocity. Based on the conventional reflec- tion wave velocity analysis method,an effective phase velocities analysis method of Rayleigh wave in pan f-k domain is proposed. In the method proposed,the relationship among phase velocity,frequency and wave number,and the relation- ship between penetration depth and wavelength are employed in order to transform the frequency-wave number (f-k) spectrum into depth-phase velocity (H-vR ) spectrum. The effectiveness of the method is proved by the analysis of one example model data and one set of real seismic data for urban active fault survey. The analysis results show that the method can effectively extract near-surface geological information with high precision and strong resistance to noise.