MODELLING OF SHEAR-WAVE RELATED ACOUSTIC PROPAGATION OF THE UK CONTINENTAL SHELF

Authors
  1. Ellis, D.D.
  2. Chapman, D.M.F.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
Broadband acoustic propagation measurements were made in summer conditions at two shallow water sites on the UK Continental Shelf, and compared with the predictions from normal mode models. Measured and modelled results are in good agreement at one site where there is a sediment layer over an acoustic basement of semi-consolidated rock. At the other site where the water is shallower and where there is no sediment layer between the water and the rock basement, very high propagation losses were measured at frequencies less than 300 Hz. These low-frequency losses were attributed to the conversion of compressional waves in the water to shear waves at the water-rock interface, but could not be modelled by the usual normal mode programs since the speed of the shear waves in the rock, presumably chalk, was comparable to the speed of sound in water. TRUNCATED
Report Number
DREA-TM-84-P — Technical Memorandum
Date of publication
15 Aug 1984
Number of Pages
19
DSTKIM No
84-04305
CANDIS No
123256
Format(s):
Microfiche filmed at DSIS;Originator's fiche received by DSIS;Hardcopy

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