Large-Scale Slides on the North Norwegian Margin Imaged by GLORIA

Abstract

Large-scale failure is widespread on the eastern margin of the Norwegian-Greenland Sea and contributes significant volumes of sediment into the Lofoten and Norwegian basins (Dowdes-well et al. 1996; Vorren et al. 1998; Taylor et al., submitted). Some of these failures are well-defined already. However, the mapping presented here identifies the full extent and nature of the Trænadjupet, Andøya, Fugloy Bank, and Bjørnøyrenna slides (Fig. 1), showing them to have many features in common. The largest failure, the Storegga Slide, has been previously mapped from geophysical data (Bugge et al. 1988; Haflidason et al. 1997).Fig. 1.Location of large-scale failures on the North Norwegian margin (grey shading), as mapped from GLORIA long-range side-scan sonar and 3.5 kHz sub-bottom profiler data. Channels shown as black