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Mapping turbidity layers using seismic oceanography methods.

Vsemirnova, E. A. and Hobbs, R. W. and Hosegood, P. (2012) 'Mapping turbidity layers using seismic oceanography methods.', Ocean science., 8 (1). pp. 11-18.

Abstract

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.

Item Type:Article
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Available under License - Creative Commons Attribution.
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.5194/os-8-11-2012
Publisher statement:© Author(s) 2012. This work is distributed under the Creative Commons Attribution 3.0 License.
Date accepted:22 December 2011
Date deposited:23 February 2016
Date of first online publication:January 2012
Date first made open access:No date available

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