Infrasound is sound at frequencies lower than the low frequency end of human hearing threshold at 20 Hz. It is known, however, that humans can perceive sounds below this frequency at very high pressure levels.[1] Infrasound can come from many natural as well as man-made sources, including weather patterns, topographic features, ocean wave activity, thunderstorms, geomagnetic storms, earthquakes, jet streams, mountain ranges, and rocket launchings.[2][3] Infrasounds are also present in the vocalizations of some animals. Low frequency sounds can travel for long distances with very little attenuation and can be detected hundreds of miles away from their sources.[4][5]
^Yeowart, N. S.; M. J. Evans (1974). "Thresholds of audibility for very low-frequency pure tones". J. Acoust. Soc. Am.55 (4): 814–818. Bibcode:1974ASAJ...55..814Y. doi:10.1121/1.1914605. PMID 4833076.
^Cook, R. K. (1969). "Atmospheric sound propagation". Atmospheric Exploration by Remote Probes. 2: 633–669.
^Procunier, R. W. (1971). "Observations of acoustic aurora in the 1-16 Hz range". Geophys. J. R. Astron. Soc. 26 (1–4): 183–189. Bibcode:1971GeoJ...26..183P. doi:10.1111/j.1365-246X.1971.tb03392.x.
^Kreithen, M. L.; D. B. Quine (1979). "Infrasound detection by the homing pigeon: A behavioral audiogram". Journal of Comparative Physiology. 129: 1–4. doi:10.1007/bf00679906. S2CID 12127549.
^Langbauer, W. R.; K. B. Payne; R. A. Charif; E. M. Thomas (1990). "Responses of captive African elephants to playback of low-frequency calls". Canadian Journal of Zoology. 67 (10): 2604–2607. doi:10.1139/z89-368.
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attenuation and can be detected hundreds of miles away from their sources. The production and perceptionofinfrasound has been observed in multiple mammals...
Infrasound, sometimes referred to as low frequency sound, describes sound waves with a frequency below the lower limit of human audibility (generally...
ultrasound and are not audible to humans. Sound waves below 20 Hz are known as infrasound. Different animal species have varying hearing ranges. Sound is defined...
auditory perception, is the ability to perceive sounds through an organ, such as an ear, by detecting vibrations as periodic changes in the pressure of a surrounding...
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where even sensitive vision may not be useful enough." Pigeons can hear infrasound. With the average pigeon being able to hear sounds as low as 0.5 Hz, they...
or misinterpretation of natural stimulus brought on by exhaustion or isolation have been proposed by psychologists. Infrasound, which can be generated...
believe that wind turbines are harmful to health. There is a belief that infrasound can cause symptoms, including tinnitus, stress, fatigue, memory loss,...
by infrasound map Polarised light compass Olfactory stimuli (see also olfactory navigation) Pigeons are also kept by enthusiasts for the enjoyment of Flying/Sporting...
energy in the area of 500 Hz. Silence Infrasound Noise with a 1/fβ spectrum, where β > 2. This formula is used to model the frequency of natural disasters...
ultrasound and infrasound. A scientist who works in the field of acoustics is an acoustician while someone working in the field of acoustics technology...
List of unexplained sounds Reassignment method Spectral music Spectrometer Strobe tuner Waveform JL Flanagan, Speech Analysis, Synthesis and Perception, Springer-...
ultrasound and infrasound. A scientist who works in the field of acoustics is an acoustician while someone working in the field of acoustics technology...
adaptation. Homing pigeons, for example, can hear the very low-pitched sound (infrasound) that carries great distances, even though most smaller animals detect...
have concluded that infrasound can cause humans to experience bizarre feelings in a room, such as anxiety, extreme sorrow, a feeling of being watched, or...
original on 10 January 2013. AGNIR (2010). Health Effects of Exposure to Ultrasound and Infrasound. Health Protection Agency, UK. pp. 167–170. Archived from...
The term "4D film" is an extension of 3D film, which gives the illusion of three-dimensional solidity. Precursors of the modern 4D film presentation include...
intimidate rivals. When individuals bellow at the water's surface, the infrasound disturbs the water in nonrandom but visually appealing patterns, leading...
However, the example of paradoxical melody above contains no infrasound (i.e. pure tone of period slower than the time window). The second paradox is that...
the levels of gases such as carbon monoxide, which are thought to contribute to reports of paranormal activity.[citation needed] Infrasound monitoring...
electromagnetic fields (EMF) and extremely low frequency sound waves (infrasound) phenomena that have been associated with allegedly haunted locations...
considered infrasound (below 20 Hz) or ultrasound (above 20 kHz) Although hearing requires an intact and functioning auditory portion of the central...
communicate in infrasound. The lower number of coils of the cochlea in Numidotherium also suggests a more limited auditory perception. Larramendi, A....
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