A submarine landslide complex affecting the Jan Mayen Ridge, Norwegian-Greenland Sea: slide-scar morphology and processes of sediment evacuation

作者：Laberg Jan S^*; Kawamura Kiichiro; Amundsen Hilde; Baeten Nicole; Forwick Matthias; Rydningen Tom A; Vorren Tore O

来源：Geo-Marine Letters, 2014, 34(1): 51-58.

DOI：10.1007/s00367-013-0345-z

Swath-bathymetry data and 2D multichannel seismics reveal for the first time an up to similar to 60 km wide amphitheater-shaped slide scar on the eastern flank of the Jan Mayen Ridge, a micro-continent in the Norwegian-Greenland Sea. The scar opens southeastward where it continues as a narrower, topographically controlled translational area. It includes secondary scars, as well as channels and escarpments. Based on the identification of secondary scars, the slide is classified as a slide complex and the total volume of missing sediments was estimated at similar to 60 km(3). From the overall shape of the scar, the upslope widening from a bottleneck- or channel-like bypass-area, the failure is inferred to have had a retrogressive development. The absence of ridges, slabs and sediment blocks indicates that the failed sediments have been evacuated entirely. The smaller channels were formed from single or repetitive smaller flows post-dating the large failure events.

• 出版日期2014-2