We present a velocity independent workflow for constructing a zero-offset reflection section that preserves most We tackle the well-known global convergence issue associated to any full waveform inversion (FWI) approach by solving an extended-image space least-squares migration problem to remove any local minima present in the FWI objective function. We discuss the connection between the reflectivity and migration velocity inversion and show the importance of combing the two problems using one objective function. Moreover, we show the full separability of the two inverse problems by using the variable projection method.


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