Multichannel seismic reflection data were obtained using as seismic source an array of two G.I. guns (Sodera) towed at a depth of 6 m. Each gun has a capacity of 105 in
for the generator chamber, as well as for the injector; they operated at a pressure of 2000-3000 PS1 in harmonic mode, The receiving streamer (Teledyne) employed 24 channels (with 20 hydrophones each), spaced 25 m apart. The nearest channel was located 150 m from the seismic source. The distance between shots was 50 m, allowing a coverage of 600%. Positioning and gun synchronization for each shot station was activated by the navigation software, NAVMAP, connected to GI gun controller system MASINI1995. Single channel lines were run at a speed of 7-8 knots using as seismic source a modified Bolt air gun and a high speed, towing single channel streamer designed by the Russian geophysical team of GIN (Moscow).