Rayleigh wave dispersion-based estimation of high-resolution 2D-subsurface shear wave velocity models: application of updated approaches.

Recent developments in surface wave methods, which enable to produce fine subsurface shear-wave velocity models by processing array data of near-field seismic surface waves, are mainly concerned with the innovation in their constituent approaches. In this paper, we present a scheme to achieve a high horizontal resolution in Rayleigh wave dispersion-based estimations of 2D-subsurface ground section. It is to apply to all steps of the method some newly updated approaches: the method based on sparse signal representation and reconstruction for generation of high-resolution phase velocity dispersion image and mode separation, the cross-correlation method combined with phase-shift scanning for extraction of dispersion curves from consecutive pair of traces, and the thin-layer stiffness matrix method and trust-region-reflective algorithm for inversion procedure. Effectiveness of the attempt was shown by the synthetic analysis for models with dipping interface of 20° and single step-shaped interface, and by a real-field data result. [ABSTRACT FROM AUTHOR]