paul sava

WEMVA diffraction focusingThis movie shows an example of waveequation MVA for a zerooffset data set. In this case, we use focusing in space, rather than focusing in offset to assess the quality of the migrated image. The frames of the movie depict: the reflectivity model (diffractors), the background velocity model, a perturbation of the velocity model, the corresponding image perturbation, the backprojection from the image perturbation into the velocity model (fat rays), and the inverted velocity perturbation after 10 iterations of conjugate gradients. ReferencesSava, P.C., Biondi, B., 2004, Waveequation migration velocity analysis  I: Theory, Geophysical Prospecting, v. 52, pp. 593606. (PDF)Sava, P.C., Biondi, B., 2004, Waveequation migration velocity analysis  II: Subsalt imaging example, Geophysical Prospecting, v. 52, pp. 607623. (PDF) Sava, P.C., Biondi, B., Etgen, J., 2005, Waveequation migration velocity analysis by focusing of diffractions and reflections, Geophysics, v. 70, no. 3, U19U27. (PDF) Sava, P.C., Vlad, I., 2008, Numeric implementation of waveequation migration velocity analysis operators, Geophysics, v. 73, pp. VE145VE159. (PDF)
