Ultrasonic Studies of Liquid/Solid Seismoacoustic Wave Phenomena.
Final rept. Apr 92-Oct 94,
SONOQUEST ADVANCED ULTRASONICS RESEARCH WELLESLEY HILLS MA
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New ultrasonic modeling findings are presented contributing to ten fundamental problems related to low-frequency seismoacoustic wave phenomena resulting from the interaction of underwater acoustic waves with heterogeneous elastic boundaries such as the ice cover andor ocean bottom. The results are described in ten independent sections covering the following problems 1 backscattering of Scholte waves and grazing underwater acoustic waves by a trench at a liquidsolid interface, 2 explanation for observed underwater acoustic backscatter from the Canada Basin near 73.2 deg N, 139 deg W where recent bathymetric charts do not reveal the existence of large bathymetric highs nearby, 3 effect of a thin low-velocity layer underneath a floating plate on flexural wave dispersion, 4 effect of viscous waves from suspended particles in a thin layer under sea ice on low-frequency underwater acoustic wave reflectivity, 5 comparison of experimental and theoretical results on the dispersion of antisymmetric edge waves along apex of truncated elastic wedge, 6 wave propagation along apex of free and immersed elastic wedge with range-dependent apex angle and cross section, 7 shear wave coupling to ice cores, 8 ultrasonic characterization of sea ice cores, 9 monostatic seismic profiling using scattering from 45 deg oblique cylindrical hole in ice plate using one compressional transducer, and 10 sea ice finger-rafting and ice thickness. MM
- Acoustic Detection and Detectors