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Velocity analysis using a conjugate gradient method
gives a better resolution than classical stacking along hyperbolas.
Furthermore it enables us to easily get the original data from the
velocity analysis panel.
Modifications of basic operators using weighting etc. may be
useful if we want to use only one iteration.
A comparison of the various ways of sampling in the velocity domain
shows that even sampling in
slowness squared should be chosen.
It would be worth trying this comparison for matrices of sizes
corresponding to the real gathers, but the amount of computer time
required for this task discouraged me from doing so.

The minimum velocity for velocity analysis should not be chosen too low,
because the data that is obtained from the velocity analysis
panel might be spoiled by noise.

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Stanford Exploration Project

1/13/1998