Abstract
Experimental measurements have shown that the use of a multilayered elastic media is necessary for transfer function numerical modeling. The present work deals with the effect of variability of ground properties (compressional and shear wave speeds, density, attenuation and thickness of the layers) on the acoustic-seismic transfer function (admittance). An analysis is performed on the planes of parameters of the ground in a wide frequency range for all angles of incidence. The Dunking–Throwers matrix approach is used to increase the accuracy of computations. It is revealed that the acoustic–seismic transfer function is sensitive to ground properties and small variations in the shear speed may cause a strong variation in the acoustic–seismic transfer function. Results of outdoor measurements of the acoustic–seismic transfer function are presented and a correlation between high magnitudes of the acoustic–seismic transfer function in certain frequency ranges and moisture content on the surface is revealed. A simple model explaining the correlation between the moisture content in the upper layer, acoustic–seismic transfer function and ground properties is suggested. [Work supported by ONR.]
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