Abstract
Shallow vertical seismic profiling (VSP) data can serve as a near‐surface characterization tool for geotechnical and seismic exploration purposes (e.g. velocities for statics or soil properties and reflection images for structure). Two hydrophone VSP surveys were acquired in shallow (∼40 m), fluid‐filled boreholes in the West Castle River area of southern Alberta. The processed hydrophone VSP data showed distinct first arrivals and credible reflections. The P‐wave velocity model is obtained by travel time inversion. The velocities range from 910 m/s in the shallow sands to 3500 m/s in the deeper competent shales. Event identification in the field data is aided by synthetic seismograms generated using a finite‐differencing algorithm. The synthetic seismograms were also used in developing and testing a processing flow for the field VSP data. A promising correlation between the VSPCDP map of the field and synthetic data indicates considerable potential for the VSP hydrophone technique in near‐surface characterization.
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