G030 WAVEFIELD MIGRATION IN GENERALIZED COORDINATES SVERRE BRANDSBERG-DAHL BP America Inc. 501 Westlake Park Blvd Houston TX 77079 USA. Abstract I present two methods for computing wavefields in inhomogeneous isotropic media. The methods rely on a ray-traced coordinate system that serves as an adaptive grid aligned with the dominant direction of the wavefield. Extrapolating the waves on this grid in the direction of the wave propagation requires less angular accuracy in the wave extrapolator so a simple propagators such as the one based on the ¢¡¤£ equation is sufficient. The coordinate is treated as a Riemannian manifold so certain smoothness constraints


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