NOAA Research-Infrasonics Program
Infrasonics is the study of sound below the range of human hearing. These low-frequency sounds are produced by a variety of geophysical processes including earthquakes, severe weather, volcanic activity, geomagnetic activity, ocean waves, avalanches, turbulence aloft, and meteors and by some man-made sources such as aircraft and explosions.
View National Ocean Service: Infrasonics locations: Quick Map | Station List | All Capabilities