INVERSION FOR THE COMPRESSIONAL WAVE SPEED PROFILE OF THE BOTTOM FROMSYNTHETIC-APERTURE EXPERIMENTS CONDUCTED IN THE HUDSON CANYON AREA

In September 1988, a series of acoustic propagation experiments were c onducted in the Hudson Canyon area. These included synthetic aperture experiments in which a source transmitting a set of four pure tones wa s towed toward/away from a vertical array of 24 receivers. Data obtain ed at 50 Hz during one of the synthetic aperture experiments are used to obtain a model for the compressional wave speed profile in the bott om using a modal inverse method. This model is further refined using 1 75-Hz data. The ability of the inferred model to predict the field at 50 Hz and higher frequencies is examined.