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Acoustic evidence of a submarine slide in the deepest part of the Arctic, the Molloy Hole
Stockholm Univ, Dept Geol Sci, S-10691 Stockholm, Sweden..
Stockholm Univ, Dept Geol Sci, S-10691 Stockholm, Sweden..
Stockholm Univ, Dept Geol Sci, S-10691 Stockholm, Sweden..
Stockholm Univ, Dept Geol Sci, S-10691 Stockholm, Sweden..ORCID iD: 0000-0002-9033-3559
Responsible organisation
2014 (English)In: Geo-Marine Letters, ISSN 0276-0460, E-ISSN 1432-1157, Vol. 34, no 4, 315-325 p.Article in journal (Refereed) Published
Abstract [en]

The western Svalbard continental margin contains thick sediment sequences with areas known to contain gas hydrates. Together with a dynamic tectonic environment, this makes the region prone to submarine slides. This paper presents results from geophysical mapping of the deepest part of the high Arctic environment, the Molloy Hole. The mapping includes multibeam bathymetry, acoustic backscatter and sub-bottom profiling. The geophysical data reveal seabed features indicative of sediment transport and larger-scale mass wasting. The large slide scar is here referred to as the Molloy Slide. It is located adjacent to the prominent Molloy Hole and Ridge system. The slide is estimated to have transported >65 km(3) of sediments over the deep axial valley of the Molloy Ridge, and further into the Molloy Hole. A unique feature of this slide is that, although its run-out distance is relatively short (<5 km), it extends over an enormous vertical depth (>2,000 m) as a result of its position in a complex bathymetric setting. The slide was most likely triggered by seismic activity caused by seafloor spreading processes along the adjacent Molloy Ridge. However, gas-hydrate destabilization may also have played a role in the ensuing slide event.

Place, publisher, year, edition, pages
2014. Vol. 34, no 4, 315-325 p.
National Category
Natural Sciences
Research subject
SWEDARCTIC 2007, LOMROG
Identifiers
URN: urn:nbn:se:polar:diva-2361DOI: 10.1007/s00367-014-0371-5ISI: 000341828100002OAI: oai:DiVA.org:polar-2361DiVA: diva2:858893
Available from: 2015-10-05 Created: 2015-10-05 Last updated: 2016-11-11

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