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Next: Vertically heterogeneous isotropic model Up: Fomel & Grechka: Nonhyperbolic Previous: HORIZONTAL REFLECTOR BENEATH A


Vertical heterogeneity is another reason for nonhyperbolic moveout. We start this section by reviewing well-known results for isotropic media. Although these results can be interpreted in terms of an effective anisotropy, we show that it has different properties than those for the VTI model. We then extend the theory to vertically heterogeneous VTI media and perform a comparative analysis of various three-parameter nonhyperbolic approximations.