CRS Stack

The CRS move-out equations can be used not only for velocity analysis but also for stacking. By stacking along the CRS travel-time surface through super-gathers, it is possible to construct a stack with enhanced SNR. This so-called CRS stack can be constructed either by directly summing over the CRS travel-time surfaces or by first summing along individual hyperbolas--as implemented by a conventional NMO stack--and subsequently summing along the apexes of these hyperbolas--as implemented by a slant stack along a pre-computed dip field (see Figure ). Thus, the SNR improvements of a CRS stack can be equivalently achieved with conventional stacking followed by a post-stack slant stack Günther (2006).