With increased interest in anisotropic propagation effects and integration of different acquisition geometries and scales into one data set, one would like to be able to conveniently use existing well-known scalar algorithms. Many generic seismic processing algorithms are based in one way or another on an isotropic assumption. Here we show a practical way, how to extend existing scalar migration or modeling algorithms to simple anisotropic symmetry systems. We compare exact anisotropic dispersion relations to their double elliptic approximation. These schemes apply only to scalar wave fields. A scalar Eigenfield is a scalar representation (not necessarily complete) of a vector Eigen field, such as reflected p-vector wave field, s-vector wave fields, Means for obtaining a scalar Eigenfield include operations like: rotations or sophisticated removal of free surface effects.


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