Arctic megaslide at presumed rest

Geissler, Wolfram H., Gebhardt, A. Catalina, Gross, Felix, Wollenburg, Jutta, Jensen, Laura, Schmidt-Aursch, Mechita C., Krastel, Sebastian, Elger, Judith and Osti, Giacomo (2016) Arctic megaslide at presumed rest Scientific Reports, 6 (38529). DOI 10.1038/srep38529.

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Supplementary data:

Abstract

Slope failure like in the Hinlopen/Yermak Megaslide is one of the major geohazards in a changing Arctic environment. We analysed hydroacoustic and 2D high-resolution seismic data from the apparently intact continental slope immediately north of the Hinlopen/Yermak Megaslide for signs of past and future instabilities. Our new bathymetry and seismic data show clear evidence for incipient slope instability. Minor slide deposits and an internally-deformed sedimentary layer near the base of the gas hydrate stability zone imply an incomplete failure event, most probably about 30000 years ago, contemporaneous to or shortly after the Hinlopen/Yermak Megaslide. An active gas reservoir at the base of the gas hydrate stability zone demonstrate that over-pressured fluids might have played a key role in the initiation of slope failure at the studied slope, but more importantly also for the giant HYM slope failure. To date, it is not clear, if the studied slope is fully preconditioned to fail completely in future or if it might be slowly deforming and creeping at present. We detected widespread methane seepage on the adjacent shallow shelf areas not sealed by gas hydrates.

Document Type: Article
Additional Information: WOS:000389298400001
Keywords: SPITSBERGEN CONTINENTAL-MARGIN; SUBMARINE LANDSLIDES; STOREGGA SLIDE; METHANE; OCEAN; SVALBARD; SLOPE; WATER; HYDRATE; RELEASE
Research affiliation: Kiel University > Kiel Marine Science
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > The Future Ocean - Cluster of Excellence > FO-R06
Kiel University
AWI
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
DOI etc.: 10.1038/srep38529
ISSN: 2045-2322
Related URLs:
Projects: Future Ocean
Date Deposited: 02 Jan 2017 09:10
Last Modified: 19 Dec 2017 12:46
URI: http://eprints.uni-kiel.de/id/eprint/35436

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