1. A method for acquiring and processing seismic data, comprising: deploying at least two marine seismic sources in a body of water at substantially the same longitudinal position from a vessel; activating the at least two marine seismic sources in a plurality of firing sequences during a seismic survey, at least one firing sequence having a different time delay between the firing of the seismic source and the start of the seismic recording; and recording the seismic data in response to activating the at least two marine seismic sources.