Use of the rupture induced, underwater sound source in the New England mud patch

Abstract

The rupture induced, underwater sound source (RIUSS) is a device utilized in underwater acoustics experiments and surveys to create high amplitude, broadband acoustic pulses. The device functions by placing a rupture disk over an evacuated chamber and mechanically breaking the disk (either by striking on demand or via hydrostatic pressure) at a specified depth to initiate a volume collapse that produces an impulsive acoustic waveform. A new configuration of the device has been developed such that multiple chambers can simultaneously be deployed along with acoustic and oceanographic recorders. This device was deployed in the New England Mud Patch in support of the 2022 seabed characterization experiment along with a variety of acoustical recorders to investigate the frequency dependent, geoacoustic properties of the muddy seabed. Discussion will focus on the newly developed source and the various methods for which the source was configured and deployed in support of the experimental requirements. Results from a number of measurements will be discussed to demonstrate the ability of the source to generate long-range propagation signals, create interface waves in the seabed, and facilitate novel methods of measuring the angle of intromission within the seabed. [Work Supported by ONR.]