Soundscape Mapping for Snapping Shrimp Noise in the Indian Ocean Region (IOR)
Dr. (Cdr.) Arnab Das
Founder and Director, MRC, Pune
Soundscape Mapping for Snapping Shrimp Noise in the Indian Ocean Region (IOR)
“Snapping Shrimps are very unique creatures that generate high intensity sound of the order of 180 dB re 1μPa at 1 m, which is louder than the big whales that are much larger in size."
Snapping Shrimps are very unique creatures that generate high intensity sound of the order of 180 dB re 1μPa at 1 m, which is louder than the big whales that are much larger in size. Another distinction is that these snapping shrimps are in large numbers within a shrimp bed (of the order of few thousands), compared to the single digits of the big whales. The mechanism of generating sound in these creatures is Cavitation which occurs due to snapping of their claws. The bursting of the cavitation bubbles generates sound in the frequency band from 2 to 250 kHz. The combined broadband sound of a snapping shrimp bed has its peak in the frequency band of 2-15 kHz with intensity of the order of 200 dB re 1μPa at 1 m. Such loud noise can impact multiple underwater systems including sonars deployed onboard Submarines and for coastal surveillance.
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Dr. (Cdr.) Arnab Das
Founder and Director, MRC, Pune
Director, Maritime Research Center, Pune