Robust moveout without velocity picking

Kevin Wolf, Daniel Rosales, Antoine Guitton, and Jon Claerbout

kxwolf@pangea.stanford.edu, daniel@sep.stanford.edu, antoine@sep.stanford.edu, jon@sep.stanford.edu

ABSTRACT

At every point in a CMP gather, a local estimate of RMS velocity is:  

$$V_{RMS}^2 = \frac{x}{t} \frac{dx}{dt}, \nonumber$$

where dt/dx is the local stepout. We form a median stack of these local velocity estimates to obtain stable estimates of RMS velocity without the conventional need to form many hyperbolic stacks.