Time-frequency analysis of the dispersive Rayleigh waves in stratified media

The dispersive characteristics of the Rayleigh waves propagated in a stratified media were analyzed by a time-frequency analysis method,the Reassignment of Smooth Pseudo-Wigner Ville Distribution(RSPWVD).Theoretical simulations and experiments were implemented for the homogeneous half-space and the two-layered half-space.The multi-mode effect exists in the dispersion curve of the Rayleigh wave in stratified media.The group velocity dispersion curves in different frequency ranges obtained by experimental result are all corresponding to the dominant modes in their surface displacement amplitudes.Such a mode-identification of the multi-mode Rayleigh waves is required in inversing the medium parameters.