1. A method of modifying a seismic image of a subsurface region comprising: identifying a plurality of locations within the seismic image that include an anomalous feature, comprising locating a dip bar at each location within the plurality of locations; indicating a plurality of structural changes associated with the anomalous feature, the structural changes selected to at least partially correct for the anomalous feature, comprising indicating a position correction of each dip bar within the seismic image as a shift along a normal ray; 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 changes to determine changes in slowness for the region wherein the inversion comprises a simultaneous inversion along a plurality of rays normal to the dip bars and; updating the velocity model based on the changes in slowness; and producing a modified seismic image on the basis of the updated velocity model.