The CDP stack at sediment velocity will stack in a lot of water borne noise. This noise is propagating somewhat off the survey line but not very far off it. Now let us think about the appearance of the CDP stack. We turn attention from offset to midpoint. The easiest way to imagine the CDP stack is to imagine the zero-offset section.
Every rock has a water velocity asymptote.
These asymptotes are evident on the CDP stack in Figure 13 . This result was first recognized by Ken Larner.