ABSTRACT: The problem of sound propagation in an acoustic layer over an acoustic half space (liquid over liquid) is solved by quadrature based on the generalized Filon method. Synthetic seismograms are computed by program NFAR1 for nearly arbitrary source-receiver distances and ranges of frequency. The user may optionally plot pressure and horizontal or vertical motion at specific distances. Test cases presented in the text demonstrate that the seismograms agree in arrival time and waveform for all anticipated events, such as direct, reflected, and refracted arrivals, including normal modes.
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