The amount of new information that can be collected with the use of multi-component cross-well data such as that analyzed here seems worth the extra cost associated with this kind of survey. Using a single common-receiver gather to invert traveltime data strongly restricted the resolution of the retrieved model. Nevertheless, the low-frequency components of the model independently estimated for each wave type showed a reasonable consistency. Furthermore, the results obtained with the proposed scheme in synthetic data indicate that the use of a more complete real dataset (with several receiver positions) will allow for a reliable layered anisotropic inversion using the elliptic approximation.
Still to be analyzed are the correlation between traveltime and particle-motion direction and the information that can be obtained from it. The absence of SH information restricts the use of the elliptical inversion for estimating transversely isotropic elastic parameters. Consequently some further effort should be made to introduce a rotational mode in the source vibration pattern, and to uncover a weak uncoherent SH energy from the available data.