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This report presents a computer program in BASIC to construct two-layer, seismic-refraction forward models with elevation and thickness variations of the upper layer and lateral velocity changes within each layer. The program accomplishes this by dividing both the upper and lower layers into vertical zones with boundaries at each station location, constructing refracted ray paths within each zone, and summing the times to travel these paths from a source point to a detector position. A requirement is that rays refracted upward from the lower layer do not cross between zones within the upper layer. True scale plots of the model with ray paths drawn to each station are visually examined to see if this condition is met before computation of arrival times proceeds. The output includes traveltime curves (X/T plots) showing direct and refracted arrival times along both forward and reverse spreads, plots of delay times, and an option to produce elevation-corrected traveltime curves and delay-time plots.

u.s. geological survey open file report/open-file report

A computer program in BASIC for construction of two-layer, seismic refraction forward models within which elevation and thickness of the upper layer change and velocities vary laterally within both layers