Submarine landslides along the Siberian termination of the Lomonosov Ridge, Arctic Ocean

Acoustic and detailed swath bathymetry data revealed a systematic picture of submarine landslides on the Siberian part Lomonosov Ridge. Whereas numerous studies mass movement exist along margin Arctic Ocean less is known from central Arctic. A regional survey comprising bathymetry, sediment echo sounder multichannel seismic profiling was performed southeastern The provide constraints present-day morphology Ridge, between 81°–84°N 140°–146°E. We mapped twelve crescent-shaped escarpments located both flanks crest are 2.1 to 10.2 km wide, 1.7 8.2 long 125 851 m high which 58 207 occupied by headscarps. Subbottom show chaotic reflections within most escarpment areas. unit overlain ~110–340 semi-coherent parallel reflections. At its bottom limited partly eroded high-amplitude reflection sequence that inclined with <1° basinwards. find be remnants landslide events mobilized 0.09 7.58 km3 sediments mid Pliocene Miocene. relatively small amounts seem typical for epoch corresponds ongoing subsidence Ridge below sea level. During time deposition load changed. suggest changes in type preconditioned, co-occurring earthquakes finally triggered landslides.