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travel time The time taken for a wave to travel from a source generator (e.g. a shot or transmitter), through some media, to a detector (geophone or receiver), at a known offset. It is used to compute travel-time curves in seismic-refraction surveying and seismic sections in seismic-refraction surveying. See also ONE-WAY TRAVEL TIME; and TWO-WAY TRAVEL TIME. Compare TRANSIT TIME.