Dispersive surface waves are routinely used to estimate the subsurface shear-wave velocity distribution, at all length scales. In the well-known Spatial Autocorrelation method, dispersion information is gained from the correlation of seismic noise signals recorded on the vertical (or radial) components. We demonstrate practical advantages of including the cross-correlation between radial and vertical components of the wavefield in a spatial cross-correlation method. The addition of cross-correlation information increases the resolution and robustness of the phase velocity dispersion information, as demonstrated in numerical simulations and a near-surface field study with active seismic sources, where our method confirms the presence of a fault-zone conduit in a geothermal field.
This article has been accepted for publication in Geophysical Journal International ©: 2014, The Authors. Published by Oxford University Press on behalf of The Royal Astronomical Society. All rights reserved.
Lamb, Andrew P.; van Wijk, Kasper; Liberty, Lee M.; and Mikesell, T. Dylan. (2014). "The Spatial Cross-Correlation Method for Dispersive Surface Waves". Geophysical Journal International, 199(1), 1-10. http://dx.doi.org/10.1093/gji/ggu237