Phase difference analysis for surface wave methods

Surface wave propagation can be analysed using a variety of signal processing techniques, most of which are based on spectral analysis. Transient data are decomposed into their monochromatic components: at each frequency the phase information can be used to compute the phase velocity, while the amplitude can be used to estimate the material attenuation. SW methods use the dispersive properties of Raleigh waves to infer the shear wave velocity profile at a site. Similarly the material attenuation can be used to estimate the dissipative properties of the deposit.