Orthorhombic anisotropy is typical of naturally fractured reservoirs. This type of anisotropy is caused by a single system of vertical fractures embedded in a horizontally layered medium. Arbitrary orthorhom- bic elastic anisotropy can be characterized by ten independent parameters, one of which is density. In the best of circumstances, only six of these parameters can be reliably inverted from the P-wave scat- tered energy. Thus, we access the resolution of S-wave inversion from the wavenumber illumination perspective and show that S waves can resolve the remaining orthorhombic parameters.


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