We analyse the framework of Full Waveform Inversion (FWI) methods for multiparameter inversion of precritical reflection data in 3D model. We coupled the Kirchhoff based forward modeling, migration and inversion for inversion of P-to-P data acquired from 3D anisotropic media. The AVO/AZ approximation of weak contrast anisotropic models and Double Square Root (DSR) equation for traveltime consideration of P-to-P are implemented during inversion. The uncertainty of the procedure is analytically and numerically tested on a synthetic data that acquired from different acquisition patterns.
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