In survey configurations for towed streamer shallow target investigations, seismic sources are placed in one or more of several zones disposed at different inline offsets relative to the streamers. In some embodiments, a vessel tows a set of one or more streamers along with a set of one or more sources disposed aft of the tail end of the streamers. In other embodiments, a vessel tows a set of one or more streamers, a set of one or more near offset sources disposed forward of the front end of the streamers, and a set of one or more far offset sources disposed forward of the near offset sources.