For the more information about natural sounds and night skies in the National Park Service, please visit http://www.nature.nps.gov/sound_night/.


Measuring Soundscapes

Microphone recording the sounds of Great Sand Dunes National Park and Preserve
A microphone records the sounds of Great Sand Dunes National Park and Preserve in Colorado. NPS Photo.

If a tree falls in the woods, and no one is around to hear it... it may have been recorded!

Efforts to protect the acoustical environment in our national parks are driven by NPS management policies. But before any action can be taken, park planners and managers need reliable data about a park's existing acoustical environment. What natural and cultural sounds can be heard at the park? What types of human-caused noises can be heard? Where, when, and how often are they heard, and how loud are they?

Through sound monitoring efforts, parks can learn about the acoustical environment as a whole and identify desirable and appropriate sound sources, as well as those that are undesirable in the park setting. Information gathered can then be used to identify the potential impacts of non-natural sounds and proposed developments or actions that may affect the acoustical environment.

Noise modeling software can help to predict how sounds will spread across a park landscape. To learn more about noise modeling, view this presentation by acoustical specialist Randy Stanley.

If you're interested in learning how to conduct acoustical monitoring, you can download the Acoustical Monitoring Training Manual.

Click to learn what we do In the Field and the Types of Data we collect.