One way of representing a subsurface that displays azimuthal anisotropy is to assume transverse isotropy with a horizontal symmetry axis. For solids that can be described in this manner, rays for reflection from a horizontal plane lie in a plane of incidence for P-P, SV-SV, and SH-SH reflection but the plane wave direction generally differs from the ray direction. For P-SV reflections, the reflection points are in the plane of incidence only for profiles parallel to or perpendicular to the symmetry direction. Except for profiles perpendicular to the symmetry direction, P-P and SV-SV moveout velocities have no obvious relation to the travel velocities of the rays.

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