1. A method for processing seismic data, comprising: deriving a first set of anisotropic parameters using seismic data; estimating a three dimensional map of stresses using the first set of anisotropic parameters; constructing a geomechanical earth model using the seismic data; generating a three dimensional map of strain based on the geomechanical earth model; and modifying the geomechanical earth model based on the first set of anisotropic parameters if the three dimensional map of stresses and the three dimensional map of strain are different.