Abstract
Travel time and amplitude of precursor arrivals of explosive sounds in shallow water contain information of marine sediments and could be used for geoacoustic inversion. The precursor arrivals have been identified in the received signals from explosive SUS charges detonated during the Seabed Characterization Experiment (SBCEX2021) conducted in the New England continental shelf and slope region in the summer of 2021. These SUS charges were deployed at various ranges along and across 200-m and 250-m bathymetry contours and recorded by two vertical line arrays (VLAs) positioned at 200-m and 250-m water depths. In addition to the two acoustic VLAs equipped with environmental sensors, there were three environmental moorings simultaneously capturing the water column fluctuation of temperature and salinity. In this research, measured precursor arrivals are first extracted and analyzed. Simulated results are then obtained and compared with the measured ones. Finally, a sensitivity study of the precursor arrivals on water column sound speed and sediment parameters (e.g., sound speed and attenuation) is performed. [Work supported by ONR Ocean Acoustics.]
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