Acoustic noise measurements of icebergs

Results are presented from a program during which the acoustic noise intensity measurements of icebergs were obtained. These data, collected on freely floating icebergs in the Labrador Sea, were analyzed to present time series of intensity and one third octave band noise level statistics. Three characteristic noises attributable to icebergs were identified; a low frequency groan or rumble, a mid to high frequency squeak and a high frequency pop. Using the observed intensity levels in conjunction with a simple model of acoustic transmission resulted in an estimated range of detection, utilizing passive means, of 1400 meters.