Real time visualization of thermohaline finestructure using Seismic Offset Groups.

Buffett, Grant George, Pelegrí, J. L., de la Puente, J. and Carbonell, R. (2012) Real time visualization of thermohaline finestructure using Seismic Offset Groups. Methods in Oceanography, 3-4 . pp. 1-13. DOI 10.1016/j.mio.2012.07.003.

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Seismic oceanography is based on the passage of a regularly repeating acoustic impulsive source and an acquisition streamer along the surface of the ocean, and on summing together all signals reflected from temperature and salinity interfaces in the ocean (where there are acoustic impedance contrasts). Due to the inherent redundancy of the method, random noise is attenuated, while signal is preserved; however, if the original signal-to-noise ratio is large enough, one need not use data from the entire streamer to create a 2D profile. A processing scheme is here devised to obtain consecutive images, known as stacks, of the structure of the water column. The scheme, named Seismic Offset Groups (SOG), consists in splitting the data from the whole streamer at a given geographical position into data produced by different streamer subsets. The method is illustrated by partitioning data from a 5-km long streamer into 7 offset groups separated by 3.5 min in time, thereby imaging the same seafloor-referenced location over a period of 21 min. As the streamer passes over a fixed geographical point, motions within the water column are observed. Each stack, created with a subset of the complete streamer, can therefore be considered an image of the water column at a particular time step (animation frame). In this way each image shows a different thermohaline fabric and the animation allows us to visualize internal ocean motions.

Document Type: Article
Additional Information: Supplementary material (Video) related to this article can be found online at
Keywords: seismic oceanography, thermohaline finestructure, visualization, seismic offset groups
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.mio.2012.07.003
ISSN: 2211-1220
Date Deposited: 03 Apr 2013 11:59
Last Modified: 22 Mar 2017 14:30

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