4. A method comprising: obtaining seismic data acquired by seismic sensors of a composite seismic signal produced by the firings of multiple seismic sources; for at least one of the seismic sources, defining a source model for a plurality of data gathers; modeling the seismic data based at least in part on the source model and at least one linear operator; for the at least one seismic source, defining at least one constraint specifying a relationship of at least two of the data gathers relative to each other; jointly determining the source model based at least in part on the modeling and the at least one constraint; and based at least in part on the determined source model, generating a dataset representing a component of the composite seismic signal attributable to one of the seismic sources.
4. A method comprising: obtaining seismic data acquired by seismic sensors of a composite seismic signal produced by the firings of multiple seismic sources; for at least one of the seismic sources, defining a source model for a plurality of data gathers; modeling the seismic data based at least in part on the source model and at least one linear operator; for the at least one seismic source, defining at least one constraint specifying a relationship of at least two of the data gathers relative to each other; jointly determining the source model based at least in part on the modeling and the at least one constraint; and based at least in part on the determined source model, generating a dataset representing a component of the composite seismic signal attributable to one of the seismic sources. 7. The method of claim 4 , wherein the act of defining the at least one constraint is based at least in part on a continuity of the gathers due to at least one feature common to the gathers.