A way to make velocity estimation robust in the presence of noise is to use
median stacks within CMPs. A problem with CMP stacks is that data from
a large range of offsets are merged despite intrinsic variations in
gain, frequency, NMO stretch, array response, and AVO. We estimate
*V*_{RMS} with a robust median estimator of slowness squared terms; each term
manufactured from neighboring traces only. Our goal is to develop a
robust code that will reasonably move out all 40 of the worldwide
Yilmaz-Cumro shot profiles Yilmaz (1987) without need for individualized parameter
choices.

5/23/2004