Sea MARC II Investigation of the Norwegian-Greenland Sea
1991
De Moustier, Christian
More than 80,000 sq km of SeaMARC II imagery was obtained in the northern Norwegian-Greenland Sea during October and November, 1989. Regions insonified included the Bjorneya Fan, a transect at 73 deg N from the continental margin to the Mohns Ridge, an along axis section of the entire Knipovich Ridge (the slowest spreading center in the world), the Molly Deep, the Spitsbergen Transform Fault, a portion of the Yermak Plateau and the 1,000 m isobath from Svalbard south to the Norwegian margin. The internal structure of the Knipovich Ridge is highly en echelon and oriented obliquely to the regional trend of the ridge. Unusual sedimentary features, perhaps related to ancient glacial activity, scour the margin of the Barents Sea its intersection with the Norwegian-Greenland Sea. Pockmarks dot hte sediment surface off the northwestern margin of Svalbard. These may be attributed to bubbles escaping from subjacent natural gas fields. Further north on the Yermak Plateau, iceberg plough marks criss-cross the terrain. In addition to routine surveying, we carried out acoustic experiments in three locations attempting to analyse the SeaMARC-II- system related effects on the acoustic measurements and to test different processing algorithms to try to improve the bathymetric function.
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