Surface-Wave Methods to Estimate S- and P-Wave Velocity Models

Abstract

Summary Common surface-waves methods aim at estimating the near-surface S-wave velocity (VS) model and consider the P-wave velocity (VP) model or Poisson’s ratio as prior information. We show the application of wavelength-depth (W/D), laterally constrained inversion (LCI), and surface-wave tomography (SWT) techniques to a large-scale data set from a stiff site to estimate both VS and VP models. The data are acquired in the scheme of carpet recording that comprises irregular deployed source-receiver layout. The W/D method directly provides the VS and VP models from the surface-wave data and is also used to estimate the a priori Poisson’s ratio required for LCI and SWT techniques. The comparison between the estimated VS and VP models of the three methods shows less than 5% difference in the majority of the investigated area.