f Calculation of spherical wave reflection and transmission coefficients and their application to shallow seismic exploration

The reflection and transmission coefficients of spherical waves vary strongly and in a more complicated manner to changing layer parameters than do the plane wave coefficients (figures 1 and 2). The difference between both types of coefficients increases when the radius of curvature of the wavefront approaches the order of the seismic wave Length. This is often the case in shallow seismic prospecting where the depth of exploration is between somet tens and a hundred meters.