Abstract: A magneto-hydrodynamic seismic source includes a casing having a central longitudinal axis; a fluid flow channel, and a plurality of electromagnets arranged along the channel for generating a uniform magnetic field at right angles to the central longitudinal axis of the channel, a first electrode positioned on a first side of the fluid flow channel, the first electrode being positioned opposite a second electrode that is positioned on a second opposing side of the fluid flow channel, and a controllable power source in electrical communication with the first electrode and the second electrode for generating a continuously varying electric field between the first electrode and second electrodes to generate a continuously varying inflow of seawater into the first end of the fluid flow channel with a corresponding continuously varying outflow of seawater in the form of a seismic signal being produced from the second end of the fluid flow channel.

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.

Abstract: A magneto-hydrodynamic seismic source includes a casing having a central longitudinal axis; a fluid flow channel, and a plurality of electromagnets arranged along the channel for generating a uniform magnetic field at right angles to the central longitudinal axis of the channel, a first electrode positioned on a first side of the fluid flow channel, the first electrode being positioned opposite a second electrode that is positioned on a second opposing side of the fluid flow channel, and a controllable power source in electrical communication with the first electrode and the second electrode for generating a continuously varying electric field between the first electrode and second electrodes to generate a continuously varying inflow of seawater into the first end of the fluid flow channel with a corresponding continuously varying outflow of seawater in the form of a seismic signal being produced from the second end of the fluid flow channel.