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Next: Poststack migration of overturning Up: Shragge and Shan: Prestack Previous: Elliptic Coordinate Extrapolation

2D synthetic tests

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 $A(\xi_1,\xi_3) s(\xi_1,\xi_3)$ 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.