Office of Naval Res., 800 N. Quincy St., Arlington, VA 22217-5666
Bolt Beranek and Newman Syst. and Technol., Arlington, VA 22209
Adv. Res. Project Agency, Arlington, VA 22203-1714
Bolt Beranek and Newman Syst. Technol., Arlington, VA 22209
Acoustic propagation experiments were conducted with explosives, an air
gun, and a continuous source on the New Jersey Continental shelf near the AMCOR
borehole 6010. This particular area was extensively surveyed by Davies et al.
[Marine Geol. 108, 323--343 (1992)] and is the site of previous acoustic
experiments by Carey et al. [Saclantcen, CP 42, a1--a27 (1993)]. Environmental
measurements of temperature, conductivity, salinity, sound speed, and
bathymetry were made and the signals were received on a vertical array at a
sufficient distance from the known source positions. Frequency-time analysis
allows for the determination of the dispersive group velocities. The relative
position of the sources provides for the assessment of sub-bottom variations on
the acoustic propagation. Preliminary results are presented and interpreted in
light of normal-mode theory.