Patent ID: 8345510

Claim:
A method for acquisition and processing of marine seismic signals to extract up- and down-going wave-fields from a seismic energy source, the method comprising: deploying at least two marine seismic energy sources at different depths in a body of water and at substantially a same longitudinal position from a seismic vessel; actuating each of the seismic energy sources in a plurality of firing sequences, each sequence having a known, different time delay between firing each source and a start of seismic signal recording; recording seismic signals corresponding to each firing sequence; extracting seismic energy corresponding to each of the sources from the recorded seismic signals; separating an up-going and a down-going wavefield using the extracted seismic energy therefrom; and propagating the separated up-going and down-going wavefields from each source to at least one of a water surface and a common reference depth, 180 degree phase shifting one of the up-going and the down-going wavefield, and summing the propagated, phase shifted up-going and down-going wavefields.