A technique for measuring in-situ compressional wave speed dispersion in marine sediments

Charles W. Holland, Jan Dettmer, Stan E. Dosso

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)748-763
Number of pages16
JournalIEEE Journal of Oceanic Engineering
Volume30
Issue number4
DOIs
StatePublished - Oct 2005

All Science Journal Classification (ASJC) codes

  • Ocean Engineering
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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