Abstract
Wave equation migration velocity analysis (WEMVA) is a family of techniques that aims to improve the subsurface velocity model by minimizing the residual in image space. However, since the true image unknown, measuring the residual in image space is a challenge for WEMVA techniques. In his paper, I present a new method of measuring the image perturbation that is based on the cross‐correlation of the observed image with a reference image in reflection angle gathers. I derive the gradient of this technique and show that it does not have the problem of cycle skipping and could be easily automated. I then show some synthetic examples and compare its gradient to the optimum WEMVA gradient.
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