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Shallow acoustic velocity and attenuation profiles have been measured in different seafloor mass-flow features of the subaqueous Mississippi Delta. Velocities of less than 1000 ft/sec occur routinely in these gas-charged muds, and energy at frequencies above approximately 100 Hz is almost completely absorbed by only a few tens of feet of very gassy sediment.High resolution seismic profiles acquired on the seafloor show frequent contamination from seafloor "ground roll," "singing" phenomena, and other trapped energy events. These observed acoustic anomalies correlate well with the known local seafloor instability features.

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