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Mapping turbidity layers using seismic oceanography methods

Vsemirnova, E.A.; Hobbs, R.W.; Hosegood, P.

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E.A. Vsemirnova

R.W. Hobbs

P. Hosegood


Using a combination of seismic oceanographic and physical oceanographic data acquired across the Faroe-Shetland Channel we present evidence of a turbidity layer that transports suspended sediment along the western boundary of the Channel. We focus on reflections observed on seismic data close to the sea-bed on the Faroese side of the Channel below 900 m. Forward modelling based on independent physical oceanographic data show that thermohaline structure does not explain these near sea-bed reflections but they are consistent with optical backscatter data, dry matter concentrations from water samples and from seabed sediment traps. Hence we conclude that an impedance contrast in water column caused by turbidity layers is strong enough to be seen in seismic sections and this provides a new way to visualise this type of current and its lateral structure. By inverting the seismic data we estimate a sediment concentration in the turbidity layers, present at the time of the survey, of 45 ± 25 mg l−1. We believe this is the first direct observation of a turbidity current using Seismic Oceanography.


Vsemirnova, E., Hobbs, R., & Hosegood, P. (2012). Mapping turbidity layers using seismic oceanography methods. Ocean Science and Discussions, 8(1), 11-18.

Journal Article Type Article
Acceptance Date Dec 22, 2011
Publication Date Jan 10, 2012
Deposit Date Jan 16, 2012
Publicly Available Date Feb 23, 2016
Journal Ocean Science and Discussions
Print ISSN 1812-0784
Electronic ISSN 1812-0792
Publisher European Geosciences Union
Peer Reviewed Peer Reviewed
Volume 8
Issue 1
Pages 11-18


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