National Park Service Sound Spectrograms

National Park Service scientists record and analyze sounds in national parks to inform and improve management of national parks across the country. The data is collected through recording systems installed by the Natural Sounds and Night Skies Division in selected parks for about a month at a time. The systems record audio as mp3 files and sound pressure levels in decibels, and are designed to replicate the hearing experience of a person on the ground.

Image of sound spectrograms provided by the Great Basin National Park