A derivation is presented of the response of an embedded thin layer to a vertically incident seismic pulse. The reflected pulse has the shape of the time derivative of the incident-wavelet, and its amplitude is proportional to the two-way traveltime in the thin layer and to a factor depending upon the ratio of acoustic impedances. The influence of spectral bandwidth on interface resolution and thin-layer response is investigated by means of zero-phase signals, and a filtering philosophy is proposed which enables thickness estimation either from amplitude or from peak-totrough time
DOLIMA, J., DEN ROOIJEN, H. and SCHOKKING, F. 1990. Anisotropy detected in shallow clays using shear-wave splitting in a VSP survey. Geophysical Prospecting 38,983-998. tion of the fast S-wave did not correspond exactly with the strike which was obtained from geological information on the fissures. The geological information was from undisturbed oriented 70 mm core samples taken at 3 m intervals in the borehole. The discrepancy, however, could be explained in terms of dipping fissures, and such a dip was confirmed by the geological and geotechnical information.The orientation of fissures is an important factor in the directional deformation and strength characteristics of clays as far as geotechnical behaviour is concerned. This study thus illustrates a practical application of shear-wave splitting observed in shallow shear-wave VSP for geology and geotechnical engineering.
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