Experiments with numerical Rayleigh waves on shallow geological models show what appear to be realistic and relevant results. It is shown that further testing with vibrator sweeps that are practical for both a vibrator and a finite-difference model would be very valuable. F-D tests with sweeps of two narrow frequency ranges were run on a single layer with uniform properties to show how the velocity of propagation depends on the thickness of the layer. Analysis of the velocity spectra of vibrator sources using different frequencies could then lead to detailed shallow shear wave velocity values.
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