infrasonic etymology

Etymology

• Infra- (Latin) - below
• Sonic (Latin) - sound

Meaning

Infrasonic refers to sounds with frequencies below the limit of human hearing, which is typically considered to be around 20 Hertz (Hz).

Origin

The term "infrasonic" was first used in the early 20th century to describe sounds that were too low in pitch to be heard by humans. These sounds were initially observed in natural phenomena such as earthquakes and storms, but later also found applications in industries and research.

In 1938, the physicist Vern Oliver Knudsen published a paper entitled "Infrasonic Vibrations Produced by Earthquakes," which helped to establish the term in scientific literature. During World War II, infrasonic waves were used as a means of detecting enemy submarines, and in the post-war era, they have been further studied and used in various fields, including:

• Medical imaging
• Geophysics
• Non-destructive testing
• Industrial noise control

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