common-depth-point stack

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common-depth-point stack (CDP stack, horizontal stack) The sum of the traces of seismic reflection data, acquired from a roll-along survey, which correspond to the same common depth point but which originate from different seismic profiles and different offsets. The technique reduces substantially the amplitude of incoherent noise, multiples with their different normal moveouts, diffractions, etc., compared with the seismic reflections.