Se. Dosso et Gh. Brooke, MEASUREMENT OF SEISMO-ACOUSTIC OCEAN-BOTTOM PROPERTIES IN THE HIGH ARCTIC, The Journal of the Acoustical Society of America, 98(3), 1995, pp. 1657-1666
This paper describes a high-resolution seismic experiment designed to
measure compressional and shear properties of the ocean bottom in the
Lincoln Sea, north of Ellesmere Island, Canada. A three-component ocea
n-bottom seismometer (OBS) was deployed through 4 m of multiyear sea i
ce in 540 m of water, and used to record broadband signals from explos
ive sources detonated on the seafloor at ranges from 35 to 900 m. Subs
equently, a layered compressional-speed model was determined from a tr
avel-time analysis of refracted compressional waves, and a shear-speed
model was determined by matching the observed dispersion characterist
ics of Scholte and shear waves using the full-wave numerical propagati
on model SAFARI. Compressional and shear attenuation coefficients were
estimated from an analysis of the decay of signal amplitude with rang
e; an approximately linear increase in attenuation with frequency was
observed for both wave types. The sensitivity of acoustic propagation
in the ocean to the various geoacoustic parameters was investigated us
ing the propagation model.