In this paper, we define an image-space inverse problem to solve for an
optimized anisotropy model. To better describe the properties of the subsurface
and the wave propagation, we use the first-order VTI two-way wave equation
to compute our Green's function. Test results on objective function
show that flatness in the angle domain is a valid measure of both velocity and
anisotropic parameter
. The results of single-parameter and joint inversions
demonstrate that we have successfully resolved the high-frequency structure in velocity
and successfully improved the anisotropic model where we have enough angle coverage.
The updated image has flattened the gathers in the angle domain.