The study, and the application of infrasound.(noun)
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Use "infrasonics" in a sentence
"The work page of Professor Richard Wiseman: his various intriguing research areas include the psychology of luck; infrasonics; the LaughLab project to find the world's funniest joke; ghosts and hauntings; and investigations into reliability of eyewitness testimony (the last particularly concerning the Indian rope trick)."
"But there's also a lot of interesting stuff at the low end - notably The Ghost in the Machine which is a proposed explanation for some ghost sightings, whereby there's some infrasonics (caused by wind through a room or whatever) that hits the resonant frequency of the human eye, around 18Hz according to NASA (pdf) causes weird visual artifacts."
"I've been playing around a little with ideas on how to augment music with ultrasonics/infrasonics."