oa Non-interactive estimation of the Marmousi velocity model by differential semblance optimization: initial trials

A subset of the Marmousi data is processed to yield an initial approximation to a kinematic velocity model. The process described is the first step in a gradient iteration scheme for a modified least-squares inversion method. The approach requires no picking or other extensive interaction with the data, and appears to avoid convergence difficulties reported for conventional least-squares inversion.