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This section presents 2D test results for a zero-offset overturning
wavefield and the prestack Pluto and BP velocity benchmark
Billette and Brandsberg-Dahl (2005) data sets. We propagate all wavefields with the
isotropic one-way extrapolator described in
Lee and Suh (1985) on a elliptic coordinate system
defined by equation 3 assuming effective slowness
fields of where stretch factor *A*
is defined above. We use generic zero-offset and shot profile
migration algorithms employing the extrapolation wavenumber in
equation 7 and then transform the results back to
Cartesian using sinc-interpolation.