Three‐dimensional numerical modeling of geoacoustic scattering from seafloor topography
作者:
Daniel R. Burns,
Ralph A. Stephen,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1990)
卷期:
Volume 88,
issue 5
页码: 2338-2345
ISSN:0001-4966
年代: 1990
DOI:10.1121/1.400076
出版商: Acoustical Society of America
关键词: SEA BED;THREE−DIMENSIONAL CALCULATIONS;FINITE DIFFERENCE METHOD;SOUND WAVES;SCATTERING;TOPOGRAPHY
数据来源: AIP
摘要:
A three‐dimensional (3‐D), second‐order finite‐difference method was used to create synthetic seismograms for wave propagation in heterogeneous media in order to investigate the scattering of elastic and acoustic energy due to topography on the seafloor. The method uses a fully staggered grid in Cartesian coordinates as developed by Virieux [Geophysics51, 889–901 (1986)]. Numerical results were generated for two models: a linear fault scarp on the seafloor, and a flat seafloor containing a rectangular channel. Wave‐front snapshots allow the scattering and focusing of different wave modes with direction to be visualized. Compressional and shear wave backscattering from the sides of the features can be seen together with the trapped compressional wave energy propagating inside the channel. The results illustrate the effects of out of the plane scattering due to simple seafloor topographic features.
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