Basic PSDM with velocity analysis : use rayt2d and sukdmig2d to compute 2D PSDM in SU. You get depth image gathers that you can convert in time (suztot) and perform a new velocity analysis, convert the new velocity model in depth with velconv adn migrate again. Stop... when the image gathers are flat enough. (the Deregowski loop) Start with a smoothed velocity model obtained after time imaging or even a constant average velocity model.

sukdmig2d also has options for migration velocity analysis but I'm not used to this procedure

D.

De: "Glenn Reynolds" gdreynolds@gmail.com À: "seismic unix" seisunix@mailman.seismic-unix.org Envoyé: Vendredi 21 Juillet 2023 11:56:39 Objet: [Seisunix] PSDM Flow

Does anyone have a basic flow for PSDM?

Another user has asked about a detailed interval velocity model, and has gathers that can be used.

There was an exercise a few years ago where people did PSDM on a land line, which generated a velocity model.

I'll post a separate question on velocity interpolation and conversion.

Cheers Glenn

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