Line GL-2 record section and velocity-depth model interpretation. Numoer of ship's navigation points Tor the profile. These results form an input file for the computer program REFPLTT which produces a travel time plot with the corrected arrival times of the ground waves at the distances calculated from corrected water wave arrival times. VB I : Apparent velocities from the 8-end of the profile. The distance is plotted as water wave travel time seconds where the water velocity was estimated to be 1. The lines were shot in the standard marine fashion by dropping charges in the water from the fantail of the icebreaker, using powder fuses and tilt table, while the ship was underway. TB 1 1 : Intercept times for layers 2 through N at 9-end of the profile. This program computes corrected ground and water wave arrival times to a datum, making corrections for the shot instant due to separation of shot and streamer and surface and bottom corrections at receiver and shot.
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