Abstract
Multichannel Analysis of Surface Waves (MASW) analysis is an efficient tool to obtain the vertical shear‐wave profile. One of the key steps in the MASW method is to generate an image of dispersive energy in the frequency‐velocity domain, so dispersion curves can be determined by picking peaks of dispersion energy. In this paper, we image Rayleigh‐wave dispersive energy and separate multimodes from a multichannel record by high‐resolution linear Radon transform (LRT). We first introduce Rayleigh‐wave dispersive energy imaging by high‐resolution LRT. We then show the process of Rayleigh‐wave mode separation. Results of synthetic and real‐world examples demonstrate that (1) compared with slant stacking algorithm, high‐resolution LRT can improve the resolution of images of dispersion energy by more than 50% (2) high‐resolution LRT can successfully separate multimode dispersive energy of Rayleigh waves with high resolution; and (3) multimode separation and reconstruction expand frequency ranges of higher mode dispersive energy, which not only increases the investigation depth but also provides a means to accurately determine cut‐off frequencies.
Published Version
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