Rayleigh-wave analysis is nowadays a standard tool for retrieving near-surface S-wave velocity models. The method, usually based on the inversion of surface-wave dispersion curves adopting a 1D forward operator, is most often applied to laterally varying sites and often on long and continuous seismic lines. The processing is performed using one of many available wavefield-transform techniques and results in several local dispersion curves estimated along the survey line. The dispersion curves are inverted to provide local S-wave velocity models which are merged to reconstruct 2D/3D structures.

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