f Co-incident CPT, borehole- and surface-seismics - A Comparison

Surface seismic measurements (CMP) using both P- and S-wave sources and multicomponent geophones enable recording of the full elastic wave-field. Under ideal conditions, the data could be separated into the constituent wave-types, which then could be processed separately. From these, it is expected, that some combinations of elastic parameters of the sub-surface (e.g. Poisson's ratio) may be determined, which are of interest for geo-technical purposes. Multicomponent measurements in a borehole (VSP) have the additional benefit of a much better signal-to-noise ratio. If supplemented with a parallel cone-penetration test (CPT), it can hopefully provide a direct ‘translation’ of the seismic parameters to the ‘geo-technical’ domain.