Anisotropy of Bottom Loss in Marine Sediments

Abstract

We observed anisotropy in the acoustic reflection amplitudes from the seafloor at Hydrate Ridge on the Oregon Margin. We analyzed acoustic data from several OBS receivers and several sound-source lines with one line being perpendicular to the others. We used time windows to isolate the acoustic data that contained the most information regarding the seafloor reflectivity. The bottom loss is directly related to these observed reflection strengths with some restrictions. The observed higher reflection strengths for the east-west line (perpendicular to bathymetric contours) than to reflection strengths on the north-south lines is unexpected and so far unexplained. We expect that the primary causes of variations in the reflectivity are due to scattering and from heterogeneity.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 2010
Accession Number
ADA527458

Entities

People

  • D. A. Lindwall
  • Warren T. Wood

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Sensors

DTIC Thesaurus Topics

  • Acoustic Reflection
  • Acoustic Waves
  • Amplitude
  • Anisotropy
  • Bottom Loss
  • Data Displays
  • Detectors
  • Frequency
  • Geophones
  • Losses
  • Measurement
  • Physical Properties
  • Reflection
  • Reflectivity
  • Reflectors
  • Seabed
  • Waves

Fields of Study

  • Physics

Readers

  • Acoustical Oceanography.
  • Oceanography.