Exact seismic velocities for TI media and extended Thomsen formulas for stronger anisotropies |

Figures 7-12 present results for vertical fractures having their normals (axes of symmetry) aligned in some direction (say ). The fracture models considered are the same and use the same data as for the preceding (VTI) case.

Thomsen's approximation and the new one are virtually identical here in for both and . For , Thomsen's approximation is higher than the exact result, while the new approximation is lower.

Results for in both Thomsen's and the new approximation are comparable to the exact results for 's up to about -, but are not identical to each other or to the exact result. For , agreement among the three curves is good for , but not so good for or .

Exact seismic velocities for TI media and extended Thomsen formulas for stronger anisotropies |

2007-09-15