In the past 10 years, vertical seismic profiles (VSPs) have played an increasingly important role in identifying and delineating in situ layers. Such VSPs have usually recorded P-wave data. Three-component shear wave trains carry three or four times more information about the source and structure of the rocks along the raypath than the equivalent P-wave train so, in principle, shear-wave VSPs should be a particularly valuable technique for examining in situ layers.
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Crampin et al. (1986) studied this question.