** Next:** Prestack BP Velocity Model
** Up:** 2D synthetic tests
** Previous:** Poststack migration of overturning

Figure presents a 2D prestack RWE migration test for
the Pluto model. The top and middle panels show the elliptic
coordinate and Cartesian migration results using FD
extrapolators. The bottom panel presents another Cartesian migration,
but generated with lower-order phase-shift plus interpolation (PSPI)
extrapolators. Note that the steeply dipping flanks on the left-most
salt body are well-imaged in the upper two panels, but not as well in
the lower panel. This suggests that higher-order extrapolators,
rather than a new coordinate system, are needed to accurately image
this salt flank. The image of the multiples beneath this salt body is
more accurately migrated in the elliptic coordinate system, suggesting
improved extrapolation has occurred in elliptic coordinates.
**PLUTO
**

Figure 4 Pluto migration
images for various coordinate systems and propagators. Top: Elliptic
coordinates with FD propagators. Middle: Cartesian coordinates with FD
propagators. Bottom: Cartesian coordinates with PSPI propagators.

** Next:** Prestack BP Velocity Model
** Up:** 2D synthetic tests
** Previous:** Poststack migration of overturning
Stanford Exploration Project

5/6/2007