Effect of seismic source bandwidth on reflection sections to image water structure.

Hobbs, R. W., Klaeschen, Dirk , Sallarès, V., Vsemirnova, E. and Papenberg, Cord (2009) Effect of seismic source bandwidth on reflection sections to image water structure. Open Access Geophysical Research Letters, 36 . L00D08. DOI 10.1029/2009GL040215.

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The seismic reflection profile is the convolution of the seismic acquisition impulse response and the target impedance contrasts. In the ocean, these contrasts are mainly determined by the widths and gradients of the temperature transitions between the different water masses. Hence seismic oceanography profiles are sensitive to the frequency bandwidth of the seismic acquisition system. We tested a novel seismic source that allowed us to simultaneously profile the ocean with differing impulse responses. We show that frequencies ∼20 Hz are best to delineate large impedance contrasts that occur over a vertical scale of several tens of meters whereas frequencies ∼80 Hz image the boundaries of layers of around 10 m. We demonstrate a towed acquisition system that can operate from a research vessel to give a bandwidth from 10 to 120 Hz that could, if required, be modified to provide frequencies up to 200 Hz.

Document Type: Article
Keywords: POS350; RV Poseidon; seismic oceanography; acquisition systems; meso-scale ocean structure
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2009GL040215
ISSN: 0094-8276
Projects: Future Ocean, GO-STREP
Date Deposited: 09 Dec 2009 11:02
Last Modified: 12 Oct 2017 11:59
URI: http://oceanrep.geomar.de/id/eprint/1754

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