Parameterization for qP Travel-time Inversion of Walk-away VSP Data in VTI Media

The presence of elastic anisotropy produces extra demands to macrovelocity model. The neglecting of anisotropic properties during migration leads to errors, so the macrovelocity model must contain information about anisotropic properties of the media. Our study is dealt with the macrovelocity model recovering in the anisotropic media. We consider tomography problem in transversal isotropic media (TI media). Before solving tomography problem it is necessary to find out the possibility of the different anisotropic parameters recovering. That is why the study is devoted to the analyses: we consider qP traveltimes in TI media and study which parameters can be recovered and which way of the TI media parameterization is the optimal one for the tomography. The obtained results prove that the Schoenberg’s parameterization is the optimal one for tomography problem in TI media.