TY - JOUR
T1 - A technique for measuring in-situ compressional wave speed dispersion in marine sediments
AU - Holland, Charles W.
AU - Dettmer, Jan
AU - Dosso, Stan E.
N1 - Funding Information:
Manuscript received January 22, 2004; revised December 2, 2004; accepted February 6, 2005. This work was supported by the Office of Naval Research and NATO Undersea Research Centre. Guest Editor: R. Gauss. C. W. Holland is with Applied Research Laboratory, The Pennsylvania State University, State College, PA 16804 USA (e-mail: [email protected]). J. Dettmer and S. E. Dosso are with the School of Earth and Ocean Sciences, University of Victoria, Victoria, BC V8W 3P6 Canada. Digital Object Identifier 10.1109/JOE.2005.862136
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2005/10
Y1 - 2005/10
N2 - Compressional speed dispersion exists in all marine sediments. If the dispersion is great enough it may play a significant role in acoustic interaction with the seabed. On the other hand if dispersion is weak, seabed models and databases can be substantially simpler. The ocean acoustics community is divided on this issue, in part because of the lack of observations. One of the experimental challenges has been to measure speed over several decades of frequency using a single technique so that observed speed changes cannot be due to different biases in the techniques. A simple in-situ experimental approach was developed that measures the critical angle as a function of frequency and thus infers the speed dispersion. Measurements on the mid to outer continental shelf (Malta Plateau and the New Jersey Shelf STRATAFORM area) show a weak dispersion over the band from ∼ 102-104 Hz. This implies (via the Kramers-Kronig relations) that the compressional wave attenuation for these sediments is small and/or approximately linear over this band.
AB - Compressional speed dispersion exists in all marine sediments. If the dispersion is great enough it may play a significant role in acoustic interaction with the seabed. On the other hand if dispersion is weak, seabed models and databases can be substantially simpler. The ocean acoustics community is divided on this issue, in part because of the lack of observations. One of the experimental challenges has been to measure speed over several decades of frequency using a single technique so that observed speed changes cannot be due to different biases in the techniques. A simple in-situ experimental approach was developed that measures the critical angle as a function of frequency and thus infers the speed dispersion. Measurements on the mid to outer continental shelf (Malta Plateau and the New Jersey Shelf STRATAFORM area) show a weak dispersion over the band from ∼ 102-104 Hz. This implies (via the Kramers-Kronig relations) that the compressional wave attenuation for these sediments is small and/or approximately linear over this band.
UR - https://www.scopus.com/pages/publications/33144477910
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U2 - 10.1109/JOE.2005.862136
DO - 10.1109/JOE.2005.862136
M3 - Article
AN - SCOPUS:33144477910
SN - 0364-9059
VL - 30
SP - 748
EP - 763
JO - IEEE Journal of Oceanic Engineering
JF - IEEE Journal of Oceanic Engineering
IS - 4
ER -
