![]() ![]() The group was experiencing bouts of periodic and deeply unpleasant nausea. His interest in infrasonic waves first came about in 1957 in the large concrete building that he and his research team were working in. ![]() One of the pioneers in infrasonic research was French scientist Vladimir Gavreau. The Allies of World War II first used infrasound to locate artillery. Subwoofers designed to produce infrasound are capable of sound reproduction an octave or more below that of most commercially available subwoofers, and are often about 10 times the size. In music, acoustic waveguide methods, such as a large pipe organ or, for reproduction, exotic loudspeaker designs such as transmission line, rotary woofer, or traditional subwoofer designs can produce low-frequency sounds, including near-infrasound. Infrasound is characterized by an ability to get around obstacles with little dissipation. People use this frequency range for monitoring earthquakes and volcanoes, charting rock and petroleum formations below the earth, and also in ballistocardiography and seismocardiography to study the mechanics of the earth. The study of such sound waves is sometimes referred to as infrasonics, covering sounds beneath 20 Hz down to 0.1 Hz (and rarely to 0.001 Hz). The ear is the primary organ for sensing low sound, but at higher intensities it is possible to feel infrasound vibrations in various parts of the body. ![]() Hearing becomes gradually less sensitive as frequency decreases, so for humans to perceive infrasound, the sound pressure must be sufficiently high. Infrasound, sometimes referred to as low frequency sound, describes sound waves with a frequency below the lower limit of human audibility (generally 20 Hz, as defined by the ANSI/ASA S1.1-2013 standard). Infrasound arrays at monitoring station in Qaanaaq, Greenland. Vibrations with frequencies lower than 20 hertz ![]()
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