A method for imaging a region of a subterranean formation during a marine survey of the subterranean formation comprising: activating a seismic source ; after each activation of the source, receiving pressure wavefields and velocity wave fields from dual sensors of streamers towed by a survey vessel along sail lines of the survey; performing wavefield separation on the pressure wavefields and the velocity wavefields to generate up-going wavefields and down-going wavefields; and calculating a down-going source wavefield that represents a primary wavefield emitted from the seismic source; generating a primaries image from the up-going and down-going source wavefields; generating a multiples image from the up-going and down-going wavefields; stacking the primaries images to generate a sail-line primaries image after traveling each sail line of the survey; stacking the multiples images to generate a sail-line multiples image after traveling each sail line of the survey; stacking the sail-line primaries images to generate a composite primaries image; stacking the sail-line multiples images to generate a composite multiples image; and combining the composite primaries image and the composite multiples image to generate a resultant three-dimensional image of the region of the subterranean formation. activating a seismic source ; after each activation of the source, receiving pressure wavefields and velocity wave fields from dual sensors of streamers towed by a survey vessel along sail lines of the survey; performing wavefield separation on the pressure wavefields and the velocity wavefields to generate up-going wavefields and down-going wavefields; and calculating a down-going source wavefield that represents a primary wavefield emitted from the seismic source; generating a primaries image from the up-going and down-going source wavefields; generating a multiples image from the up-going and down-going wavefields; stacking the primaries images to generate a sail-line primaries image after traveling each sail line of the survey; stacking the multiples images to generate a sail-line multiples image after traveling each sail line of the survey; stacking the sail-line primaries images to generate a composite primaries image; stacking the sail-line multiples images to generate a composite multiples image; and combining the composite primaries image and the composite multiples image to generate a resultant three-dimensional image of the region of the subterranean formation. receiving pressure wavefields and velocity wave fields from dual sensors of streamers towed by a survey vessel along sail lines of the survey; performing wavefield separation on the pressure wavefields and the velocity wavefields to generate up-going wavefields and down-going wavefields; and calculating a down-going source wavefield that represents a primary wavefield emitted from the seismic source; generating a primaries image from the up-going and down-going source wavefields; generating a multiples image from the up-going and down-going wavefields; stacking the primaries images to generate a sail-line primaries image after traveling each sail line of the survey; stacking the multiples images to generate a sail-line multiples image after traveling each sail line of the survey; stacking the sail-line primaries images to generate a composite primaries image; stacking the sail-line multiples images to generate a composite multiples image; and combining the composite primaries image and the composite multiples image to generate a resultant three-dimensional image of the region of the subterranean formation. <EOS>