Abstract: A method and a system of marine seismic surveying is disclosed. The method includes the step of acquiring a set of seismic survey data in a marine seismic survey, the set of acquired seismic survey data including a first received signal generated by a first source signal, and, a second received signal generated by a second source signal, wherein the first source signal is a continuously varying seismic signal transmitted by a first source over a predetermined period of time, and, the second source signal is an impulsive seismic signal transmitted by a second source signal over the same predetermined period of time; and, processing the acquired set of seismic survey data to extract the first received signal and the second received signal. In a preferred form, the first source is a magneto-hydrodynamic source.