1. A method of modifying a seismic image of a subsurface region comprising: identifying a location within the seismic image that includes an anomalous feature; indicating a structural change associated with the distortion, the structural change selected to at least partially correct for the anomalous feature; identifying a region causing the anomalous feature in which corrections to a velocity model corresponding to the seismic image are to be applied; performing an inversion for the region in accordance with the indicated structural change; updating the velocity model on the basis of the inversion; and producing a modified seismic image on the basis of the updated velocity model.