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

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• 作者：Jan S. Laberg (1)
  Kiichiro Kawamura (2)
  Hilde Amundsen (1)
  Nicole Baeten (1)
  Matthias Forwick (1)
  Tom A. Rydningen (1)
  Tore O. Vorren (1)
  
• 刊名：Geo-Marine Letters
• 出版年：2014
• 出版时间：February 2014
• 年：2014
• 卷：34
• 期：1
• 页码：51-58
• 全文大小：1,316 KB
• 作者单位：Jan S. Laberg (1)
  Kiichiro Kawamura (2)
  Hilde Amundsen (1)
  Nicole Baeten (1)
  Matthias Forwick (1)
  Tom A. Rydningen (1)
  Tore O. Vorren (1)
  
  1. Department of Geology, University of Troms?, 9037, Troms?, Norway
  2. Graduate School of Science and Engineering, Yamaguchi University, 1677-1 Yoshida, Yamaguchi, 753-8511, Japan
  
• ISSN：1432-1157

文摘

Swath-bathymetry data and 2D multichannel seismics reveal for the first time an up 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 ~60?km3. 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.