Accession Number : ADA116399

Title :   Acoustic Reflection from Anisotropic Sediments.

Descriptive Note : Technical rept.,

Corporate Author : TEXAS UNIV AT AUSTIN APPLIED RESEARCH LABS

Personal Author(s) : Oakley,David W

PDF Url : ADA116399

Report Date : 01 Jun 1982

Pagination or Media Count : 88

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)

Descriptors :   *Acoustic reflection, Ocean bottom, Sediments, Sedimentary rock, Acoustic velocity, Anisotropy, Coefficients

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE