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Reference.org
Perception of infrasound
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<p><a href="/facts/Infrasound/yCUJSSe3">Infrasound</a> is sound at frequencies lower than the low frequency end of human hearing threshold at 20 Hz. It is known, however, that humans can perceive sounds below this frequency at very high pressure levels. Infrasound can come from many natural as well as man-made sources, including weather patterns, topographic features, ocean wave activity, thunderstorms, <a href="/facts/Geomagnetic_storms/4rD8DSlm">geomagnetic storms</a>, earthquakes, <a href="/facts/Jet_streams/cVqkU0V3">jet streams</a>, mountain ranges, and rocket launchings. Infrasounds are also present in the vocalizations of some animals. Low frequency sounds can travel for long distances with very little attenuation and can be detected hundreds of miles away from their sources. </p>