The effect of sediment rigidity on bottom reflection loss in a typical deep sea sediment
作者:
Paul J. Vidmar,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1980)
卷期:
Volume 68,
issue 2
页码: 634-638
ISSN:0001-4966
年代: 1980
DOI:10.1121/1.384721
出版商: Acoustical Society of America
关键词: SEDIMENTS;SEAS;REFLECTION;LAYERS;FREQUENCY DEPENDENCE;SUBSTRATES;SEISMIC S WAVES
数据来源: AIP
摘要:
The effect of sediment rigidity on bottom reflection loss, RL=−20 log10‖R‖, whereRis the plane‐wave reflection coefficient, is studied using a computational model. A single inhomogeneous turbidite layer overlying a homogeneous substrate is treated with an emphasis on low frequencies (10 to 200 Hz) and low grazing angles (0 ° to 45 °). We find that sediment rigidity can be neglected for thick layers (∠500 m) while it can produce significant increases in RL for thin layers (∠36 m). The frequency dependence of RL for thin layers has a low‐frequency regime characterized by large peaks (∠25 dB) recurring at short (∠2 Hz) intervals. At high frequencies there remains a persistent increase in RL (∠4 dB). The most important mechanism for sedimentS‐wave excitation is found to be compressional wave conversion at the sediment–substrate interface.
点击下载:
PDF
(726KB)
返 回