ASA 126th Meeting Denver 1993 October 4-8  1pAO4. Ultrasonic
modeling of sea ice seismoacoustic wave phenomena.  Jacques R.
Chamuel  Sonoquest Advanced Ultrason. Res., P. O. Box 153,
Wellesley Hills, MA 02181-5339  A variety of broadband Arctic
seismoacoustic wave phenomena are demonstrated using laboratory
ultrasonic modeling techniques introduced by the author in the
mid 1970s to study the generation, propagation, detection, and
scattering of low-frequency underwater acoustic waves coupled to
the heterogeneous ice cover. Data on frequency-dependent under-
ice reflectivity, effective elastic properties, low-frequency
transmission loss, horizontal refraction, wave conversion, and
low grazing angle backscattering are discussed. Different guided
leaky and trapped waves from range-dependent models are isolated
and examined including flexural waves, shear horizontal waves,
Rayleigh waves, Scholte waves, edge plate waves, and wedge
waves. The laboratory models consisted of finite floating plates
with cracks, ridges