ASA 128th Meeting - Austin, Texas - 1994 Nov 28 .. Dec 02

1aAO10. Experimental determination of broadband propagation under known geophysical conditions.

Mohsen Badiey

Office of Naval Res., 800 N. Quincy St., Arlington, VA 22217-5666

Mike Steele

Bolt Beranek and Newman Syst. and Technol., Arlington, VA 22209

William Carey

Adv. Res. Project Agency, Arlington, VA 22203-1714

Pejhan Peymani

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.