average velocity (time-averaged velocity, v−) The ratio of a given depth divided by the travel time to that depth, usually assuming straight ray paths and parallel layering. Thus v− = zn/tn, where zn is the depth of the top n layers and tn the single-travel time through those n layers. Also, v− = σzi/σti where zi and ti are the thickness of and single-travel time through the ith layer respectively, and σ is the total thickness and total travel time respectively of the overlying layers.
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