Acoustic Reflection from Anisotropic Sediments.

Abstract

Measurements of an excess of horizontal to vertical velocity (averaging 10% for shales), have been made in marine sediments and in sedimentary rocks. In this paper, the proposed causes of such anisotropies are reviewed, and the reflection coefficient for incidence from water onto a solid sea floor is derived for plane wave solutions of the anisotropic wave equations. The possibility of backward traveling fronts of pressure amplitude at low grazing angles is noted. A propagation matrix formation is established to generalize the reflection coefficient for the case of multiple layers. Bottom loss calculations are made which suggest that anisotropy can increase the reflectivity of the ocean floor. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1982
Accession Number
ADA116399

Entities

People

  • David W. Oakley

Organizations

  • University of Texas at Austin

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Acoustic Reflection
  • Bottom Loss
  • Crystal Structure
  • Differential Equations
  • Elastic Waves
  • Equations
  • Equations Of Motion
  • Geophysics
  • Grazing Angles
  • Measurement
  • Military Research
  • Molecular Dynamics
  • New York
  • Physics Laboratories
  • Seabed
  • Secondary Waves
  • Sedimentary Rocks

Readers

  • Acoustical Oceanography.
  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Geotechnical Engineering.