Sound visualization (IMAGE) University of Washington Caption This spectrogram (a visualization of sound level at different frequencies) shows an hour of audio collected at one of the study sites, Third Beach, on Oct. 3, 2017. Each peak is a military Growler aircraft flight, with brighter colors indicating louder noise levels. Credit Lauren Kuehne Usage Restrictions credit required License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.