Fram Slide off Svalbard: A new type of glacial continental margin slope failure
Presented by Elger JUDITH on 23 Sep 2013 from 17:15 to 19:15
Type: Poster presentation
Session: Poster session
Submarine slop failures are a wide spread phenomena and a huge geo hazard. They reshape margin landscapes and can destroy seafloor installations or even coastal infrastructure by generating tsunamis. The mechanisms that create submarine landslides at continental margins are believed to be related to rapidly deposited glacigenic material generating overpressure in previously deposited hemi-pelagic sediments. However, knowledge about the main reasons for the destabilization of slopes is still partial since these results are mainly related to the studies of the Storegga Slide and might not be representable. Here we show a newly discovered landslide off Svalbard called Fram Slide. We discuss which destabilizing factors may contributed there to submarine slope instability while we show that there is no indication for rapid glacigenic debris deposition. We use bathymetric, 2D high resolution seismic and Parasound data to study the shape and the structure of the slide area. Apart from tectonic movement and over-steepening of the slope we consider overpressure due to the cementation by gas hydrates to play a major role because there is evidence for faults, free gas beneath gas hydrates and upwards migrating fluids and gas. Our results demonstrate that there are other major processes that determine the genesis of slop failures which has to be studied more detailed and that the Fram Slide is an excellent example to document their relevance.
Location: GEOMAR East shore
Address: Wischhofstr. 1-3 / D-24148 Kiel