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Submarine mass wasting on Hovgaard Ridge, Fram Strait, European Arctic

Forwick, Matthias; Laberg, Jan Sverre; Husum, Katrine; Gales, Jenny. 2016 Submarine mass wasting on Hovgaard Ridge, Fram Strait, European Arctic. In: Lamarche, Geoffroy; Mountjoy, Joshu; Bull, Suzanne; Hubble, Tom; Krastel, Sebastian; Lane, Emily; Micallef, Aaron; Moscardelli, Lorena; Mueller, Christof; Pecher, Ingo; Woelz, Susanne, (eds.) Submarine Mass Movements and their Consequences: 7th International Symposium. Cham, Switzerland, Springer International Publishing, 253-263, 621pp. (Advances in Natural and Technological Hazards Research, 41).

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Abstract/Summary

Hovgaard Ridge is an 1800 m high bathymetric high in the Fram Strait, the only deep-water gateway between the Arctic Ocean and the other World’s oceans. The slopes of the ridge provide evidence of various types of sediment reworking, including (1) up to 12 km wide single and merged slide scars with maximum ~30 m high headwalls and some secondary escarpments; (2) maximum 3 km wide and 130 m deep slide scars with irregular internal morphology, partly narrowing towards the foot of the slope; (3) up to 130 m deep, 1.5 km wide and maximum 8 km long channels/gullies originating from areas of increasing slope angle at the margins of a plateau on top of the ridge. Most slide scars result presumably from retrogressive failure related to weak layers in contourites or ash. The most likely trigger mechanism is seismicity related to tectonic activity within the nearby mid-ocean fracture zone. Gully/channel formation is suggested to result from cascading water masses and/or from sediment gravity flows originating from failure at the slope break after winnowing on the plateau of the ridge.

Item Type: Publication - Book Section
Digital Object Identifier (DOI): 10.1007/978-3-319-20979-1_25
ISBN: 9783319209784
ISSN: 1878-9897
Additional Keywords: Submarine slope failures; Channels/gullies; Fram Strait; Hovgaard Ridge; European Arctic
Date made live: 13 Oct 2016 14:44 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/514824

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