Spherical-wave AVO-modelling in elastic VTI-media

Arnim B. Haase, Charles P. Ursenbach

The AVO response of two-layer VTI models for AVO Class I is investigated. Graebner/Rueger reflection coefficients and the "Weyl-integral for anisotropic media" are utilized for the computation. Spherical wave results are compared with the plane-wave reflectivity. Depth dependence of spherical wave AVO is found to be strongest near critical angles, as was observed in the isotropic situation. Both C-wave AVO and P-wave AVO are more sensitive to changes in anisotropy than to changes in depth.