Vector acoustic properties of acoustic modes as generated from explosive sources in a shallow-water waveguide

Vector acoustic measurements of explosive sources can show structure in the sound field that is not discernible from traditional pressure-only measurement. This structure, derived from coherent combinations of acoustic velocity and pressure, is known to be sensitive to sediment layering and composition. Measurements made during the 2022 Seabed Characterization Experiment along a range-independent section of the New England Mud Patch (NEMP) are presented. Recordings of 32 explosive SUS charges at ranges of 4–15 km show significant dispersion of 4 modes allowing for vector properties of individual modes to be inferred. These vector properties are compared with results from the acoustic normal mode model ORCA based on a nominal geoacoustic model of the NEMP. The results are analyzed for their usefulness in locating modes and characterizing seafloor acoustic properties.