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Infrasound

3:26

Mystery of Elephant Infrasounds Revealed | Animal Super Senses | BBC Earth

2:50

On vibrating eyeballs, ghosts, and the strange science of infrasound

2:16

The Infrasound Network and how it works

3:59

Can Low Frequency Sound Waves Make You Sick?

1:04

High-Altitude Infrasound Recorded For First Time In 50 Years | Video

Infrasound, sometimes referred to as low-frequency sound, is sound that is lower in frequency than 20 Hz or cycles per second, the "normal" limit of human hearing. Hearing becomes gradually less sensitive as frequency decreases, so for humans to perceive infrasound, the sound pressure must be sufficiently high. The ear is the primary organ for sensing infrasound, but at higher intensities it is possible to feel infrasound vibrations in various parts of the body.
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    • History and study 

    • Animal reaction 

    • Human reactions 

    • Detection and measurement