| Summary: | High-resolution seismic investigations have been carried out jointly by the Alfred-Wegener-Institut für Polar- und Meeresforschung (Bremerhaven) and the Renard Centre of Marine Geology (State University of Ghent, Belgium) in the Weddell Sea basin during the austral summer season 1986-1987. A total of 2869 km of seismic profiles, most of them with 24-channel data acquisition, have been shot in surveys which addressed four distinct marine geological domains : (a) oblique prograding sediment wedges in the southern Weddell Sea, off Filchner Ice Shelf and Halley Bay (b) a thick sedimentary sequence which possibly represents the distal part of a very extensive sedimentary fan, overlying the axial zone of a failed rift/drift basin ( c ) the continental margin off Riiser-Larsen Ice Shelf and Cape Norvegia, close to the Explora Escarpment and the Wegener Canyon, where seismic support was provided to the ongoing drilling activities in the framework of Leg 113 of the Ocean Drilling Program (d) the active plate boundary between Bransfield Strait and the South Orkneys, where a back-arc extensional basin is found in close association with an oblique subduction zone.
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