Mapping turbidity layers using seismic oceanography methods
Vsemirnova, E.A.; Hobbs, R.W.; Hosegood, P.
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. https://doi.org/10.5194/os-8-11-2012
|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|
|Publisher||European Geosciences Union|
|Peer Reviewed||Peer Reviewed|
Published Journal Article
Publisher Licence URL
© Author(s) 2012. This work is distributed under the Creative Commons Attribution 3.0 License.
You might also like
Uncertainties in Ray-Tracing Tomography Models Used for Sub-Basalt Seismic Imaging