Below 20 Hertz: The Rumbling Realm Of Infrasound

Artwork by Andy Gilmore

Infrasound is the realm of sounds in the frequency range of 20 Hz down to 0.001 Hz. According to Harry F. Olson in his book Maths, Physics and Engineering: 20 Hz is considered the normal low frequency limit of human hearing. The lower the frequency of sound, the more difficult it us for human to hear it. So, in order for us …