1. A method comprising: obtaining seismic data acquired by seismic sensors of a composite seismic signal produced by the firings of multiple seismic sources; modeling the seismic data based at least in part on models for the sources and linear operators; defining at least one constraint specifying an interdependency between at least two of the models, wherein the at least two models are different; jointly determining the models based at least in part on the modeling and the at least one constraint; and based at least in part on the determined models, generating a dataset representing a component of the composite seismic signal attributable to one of the seismic sources.