VERTICAL HETEROGENEITY

Vertical heterogeneity is an important cause of nonhyperbolic moveout. We start this section with reviewing the well-known results of the isotropic theory. We show that these results can be interpreted in terms of an effective anisotropy, which has different properties than the transversally isotropic model. Then we extend the theory to the case of anisotropy coupled with vertical heterogeneity and perform a comparative analysis of different three-parameter nonhyperbolic approximations.