We examine the sensitivity of the Born model to the input background velocity. We use a one-dimensional analytic example to point out the difference between a corrective procedure and merely a perturbative one. We examine various aspects of the sensitivity issue, including the tradeoff between velocity determination and mapping of reflector location. Although this problem is discussed within the context of the Born model, it is an issue common to all perturbative methods (e.g., migration methods) which transform surface reflection data into a map of subsurface reflectors.

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