f Linearized elastic inversion for multioffset marine seismic data

For each shot s, the linearization consists in substituting the observed field Ps by the sum of the primary field Ps and of the scattered field ðPs where Ps corresponds to the non linear propagation in the reference medium m0 and ðPs is a linear function of the perturbation ðm which is computed from the Jacobian Js of the non linear operator at m0 . The process of linearization is associated with smalt perturbations.