Strange Animal Noise That Sounds Like a Turbo Booster

Strange Animal Noise That Sounds Like a Turbo Booster

Vibrations with frequencies lower than xx Hertz

Infrasound, sometimes referred to as low status sound, describes sound waves with a frequency below the lower limit of human audibility (generally 20 Hz). 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 low audio, but at college intensities information technology is possible to feel infrasound vibrations in various parts of the body.

The study of such sound waves is sometimes referred to as infrasonics, roofing sounds beneath xx Hz down to 0.ane Hz (and rarely to 0.001 Hz). People use this frequency range for monitoring earthquakes and volcanoes, charting rock and petroleum formations beneath the earth, and as well in ballistocardiography and seismocardiography to study the mechanics of the centre.

Infrasound is characterized by an ability to become around obstacles with little dissipation. 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. Subwoofers designed to produce infrasound are capable of sound reproduction an octave or more below that of most commercially bachelor subwoofers, and are ofttimes about x times the size.^{[ commendation needed ]}

Definition [ edit ]

Infrasound is defined by the American National Standards Institute every bit "sound at frequencies less than xx Hz". ^[1]

History and study [ edit ]

The Allies of World State of war I first used infrasound to locate artillery. ^[2] One of the pioneers in infrasonic research was French scientist Vladimir Gavreau. ^[3] His interest in infrasonic waves start came about in 1957 in the large physical building that he and his inquiry team were working in. The group was experiencing bouts of periodic and securely unpleasant nausea. After weeks of speculation on the source of the nausea — the team was convinced that it was a pathogen or an untraced leak of noxious chemic fumes in the facility — they discovered that a "loosely poised low speed motor… was developing [these] 'nauseating vibrations'". ^[3]

When Gavreau and the team attempted to mensurate an amplitude and pitch, they were shocked when their equipment detected no audible audio. They concluded the audio beingness generated by the motor was then low in pitch that it was below their biological ability to hear, and that their recording equipment was not capable of detecting these frequencies. Nobody had conceived that sound might be at such depression frequencies, and so no equipment had been developed to detect it. Eventually, it was determined that the sound inducing the nausea was a seven wheel per 2d infrasound wave that was inducing a resonant fashion in the ductwork and architecture of the building, significantly amplifying the audio. ^[3] In the wake of this serendipitous discovery, the researchers shortly got to work preparing further infrasonic tests in the laboratories. One of his experiments was an infrasonic whistle, an oversized organ pipe. ^{[4] [5] [6]} As a effect of this and similar incidents, it has go routine in new compages construction to inspect for and eliminate any infrasonic resonances in cavities and the introduction of sound-proofing and materials with specialized sonic properties.

Sources [ edit ]

Patent for a double bass reflex loudspeaker enclosure design intended to produce infrasonic frequencies ranging from 5 to 25 hertz, of which traditional subwoofer designs are non readily capable.

Infrasound tin result from both natural and man-made sources:

• Natural events: infrasonic sound sometimes results naturally from astringent weather, surf, ^[7] lee waves, avalanches, earthquakes, volcanoes, ^{[8] [nine]} bolides, ^[10] waterfalls, calving of icebergs, aurorae, meteors, lightning and upper-atmospheric lightning. ^[11] Nonlinear bounding main wave interactions in ocean storms produce pervasive infrasound vibrations effectually 0.2 Hz, known as microbaroms. ^[12] Co-ordinate to the Infrasonics Program at NOAA, infrasonic arrays can be used to locate avalanches in the Rocky Mountains, and to find tornadoes on the loftier plains several minutes before they touch down. ^[13]

• Creature communication: whales, elephants, ^[fourteen] hippopotamuses, ^[15] rhinoceroses, ^{[xvi] [17]} giraffes, ^[18] okapis, ^[19] peacocks, ^[20] and alligators are known to use infrasound to communicate over distances—upwardly to hundreds of miles in the case of whales. In particular, the Sumatran rhino has been shown to produce sounds with frequencies equally low as 3 Hz which have similarities with the song of the humpback whale. ^[17] The roar of the tiger contains infrasound of 18 Hz and lower, ^[21] and the purr of felines is reported to comprehend a range of xx to l Hz. ^{[22] [23] [24]} It has as well been suggested that migrating birds use naturally generated infrasound, from sources such as turbulent airflow over mountain ranges, as a navigational aid. ^[25] Infrasound also may be used for long-distance communication, specially well documented in baleen whales (see whale vocalization), and African elephants. ^[26] The frequency of baleen whale sounds tin range from 10 Hz to 31 kHz, ^[27] and that of elephant calls from xv Hz to 35 Hz. Both can exist extremely loud (around 117dB), allowing communication for many kilometres, with a possible maximum range of around x km (half-dozen mi) for elephants, ^[28] and potentially hundreds or thousands of kilometers for some whales.^{[ commendation needed ]} Elephants too produce infrasound waves that travel through solid ground and are sensed by other herds using their feet, although they may be separated by hundreds of kilometres. These calls may be used to coordinate the movement of herds and let mating elephants to find each other. ^[29]

• Human being singers: some vocalists, including Tim Storms, can produce notes in the infrasound range. ^[thirty]

• Human created sources: infrasound tin can be generated past human processes such every bit sonic booms and explosions (both chemical and nuclear), or by mechanism such as diesel engines, wind turbines and specially designed mechanical transducers (industrial vibration tables). Certain specialized loudspeaker designs are also able to reproduce extremely low frequencies; these include large-scale rotary woofer models of subwoofer loudspeaker, ^[31] besides every bit large horn loaded, bass reflex, sealed and manual line loudspeakers. ^{[32] [33]}

Animate being reaction [ edit ]

Some animals have been thought to perceive the infrasonic waves going through the earth, caused by natural disasters, and to use these as an early alert. An instance of this is the 2004 Indian Body of water earthquake and seismic sea wave. Animals were reported to accept fled the surface area hours before the actual tsunami hit the shores of Asia. ^{[34] [35]} It is non known for sure that this is the crusade; some have suggested that information technology may have been the influence of electromagnetic waves, and not of infrasonic waves, that prompted these animals to abscond. ^[36]

Inquiry in 2013 past Jon Hagstrum of the US Geological Survey suggests that homing pigeons use depression-frequency infrasound to navigate. ^[37]

Human reactions [ edit ]

20 Hz is considered the normal low-frequency limit of homo hearing.^{[ citation needed ]} When pure sine waves are reproduced under ideal weather condition and at very high volume, a human listener volition exist able to identify tones as low as 12 Hz. ^[38] Below 10 Hz it is possible to perceive the single cycles of the audio, along with a sensation of pressure level at the eardrums.

From almost g Hz, the dynamic range of the auditory system decreases with decreasing frequency. This pinch is observable in the equal-loudness-level contours, and it implies that fifty-fifty a slight increase in level tin can change the perceived loudness from barely aural to loud. Combined with the natural spread in thresholds within a population, its outcome may be that a very low-frequency sound which is inaudible to some people may exist loud to others.

One study has suggested that infrasound may cause feelings of awe or fear in humans. Information technology has as well been suggested that since information technology is not consciously perceived, it may make people feel vaguely that odd or supernatural events are taking place. ^[39]

A scientist working at Sydney University's Auditory Neuroscience Laboratory reports growing prove that infrasound may impact some people'south nervous system by stimulating the vestibular organization, and this has shown in animal models an effect similar to bounding main sickness. ^[40]

In research conducted in 2006 focusing on the bear upon of sound emissions from current of air turbines on the nearby population, perceived infrasound has been associated to effects such equally annoyance or fatigue, depending on its intensity, with little testify supporting physiological effects of infrasound below the man perception threshold. ^[41] Later studies, however, have linked inaudible infrasound to effects such as fullness, pressure level or tinnitus, and acknowledged the possibility that information technology could disturb sleep. ^[42] Other studies have as well suggested associations betwixt noise levels in turbines and self-reported sleep disturbances in the nearby population, while adding that the contribution of infrasound to this effect is yet not fully understood. ^{[43] [44]}

In a study at Ibaraki University in Japan, researchers said EEG tests showed that the infrasound produced by wind turbines was "considered to be an annoyance to the technicians who work shut to a mod large-scale wind turbine". ^{[45] [46] [47]}

Jürgen Altmann of the Dortmund University of Applied science, an expert on sonic weapons, has said that there is no reliable evidence for nausea and vomiting acquired by infrasound. ^[48]

High book levels at concerts from subwoofer arrays have been cited every bit causing lung collapse in individuals who are very close to the subwoofers, particularly for smokers who are particularly alpine and thin. ^[49]

In September 2009, London educatee Tom Reid died of sudden arrhythmic death syndrome (SADS) after complaining that "loud bass notes" were "getting to his heart". The inquest recorded a verdict of natural causes, although some experts commented that the bass could have acted every bit a trigger. ^[50]

Air is a very inefficient medium for transferring low frequency vibration from a transducer to the human being torso. ^[51] Mechanical connection of the vibration source to the human trunk, however, provides a potentially dangerous combination. The U.Due south. space program, worried about the harmful effects of rocket flying on astronauts, ordered vibration tests that used cockpit seats mounted on vibration tables to transfer "brown note" and other frequencies straight to the human subjects. Very high power levels of 160 dB were achieved at frequencies of two–3 Hz. Test frequencies ranged from 0.5 Hz to forty Hz. Test subjects suffered motor ataxia, nausea, visual disturbance, degraded task functioning and difficulties in advice. These tests are causeless by researchers to be the nucleus of the electric current urban myth. ^{[52] [53]}

The written report "A Review of Published Enquiry on Low Frequency Noise and its Effects" ^[54] contains a long list of inquiry about exposure to loftier-level infrasound among humans and animals. For instance, in 1972, Borredon exposed 42 immature men to tones at 7.five Hz at 130 dB for 50 minutes. This exposure caused no adverse effects other than reported drowsiness and a slight blood pressure increase. In 1975, Slarve and Johnson exposed four male subjects to infrasound at frequencies from i to 20 Hz, for 8 minutes at a time, at levels up to 144 dB SPL. At that place was no prove of whatever detrimental effect other than centre ear discomfort. Tests of high-intensity infrasound on animals resulted in measurable changes, such as cell changes and ruptured blood vessel walls.

In Feb 2005 the television set prove MythBusters used twelve Meyer Audio 700-HP subwoofers—a model and quantity that has been employed for major rock concerts. ^{[55] [56]} Normal operating frequency range of the selected subwoofer model was 28 Hz to 150 Hz ^[57] but the 12 enclosures at MythBusters had been specially modified for deeper bass extension. ^[58] Roger Schwenke and John Meyer directed the Meyer Audio squad in devising a special examination rig that would produce very loftier sound levels at infrasonic frequencies. The subwoofers' tuning ports were blocked and their input cards were contradistinct. The modified cabinets were positioned in an open ring configuration: four stacks of three subwoofers each. Test signals were generated by a SIM 3 audio analyzer, with its software modified to produce infrasonic tones. A Brüel & Kjær audio level analyzer, fed with an attenuated bespeak from a model 4189 measurement microphone, displayed and recorded sound pressure levels. ^[58] The hosts on the show tried a serial of frequencies equally depression equally v Hz, attaining a level of 120decibels of audio pressure at nine Hz and up to 153 dB at frequencies above twenty Hz, but the rumored physiological effects did non materialize. ^[58] The test subjects all reported some physical feet and shortness of breath, even a small amount of nausea, merely this was dismissed by the hosts, noting that sound at that frequency and intensity moves air apace in and out of one's lungs. The testify alleged the brown note myth "busted."

Infrasound is one hypothesized crusade of expiry for the nine Russian hikers who were found expressionless at Dyatlov Pass (almost Siberia) in 1959. ^[59]

Infrasonic 17 Hz tone experiment [ edit ]

On 31 May 2003, a grouping of Britain researchers held a mass experiment, where they exposed some 700 people to music laced with soft 17 Hz sine waves played at a level described as "near the border of hearing", produced by an extra-long-stroke subwoofer mounted ii-thirds of the way from the end of a vii-meter-long plastic sewer pipage. The experimental concert (entitled Infrasonic) took identify in the Purcell Room over the course of two performances, each consisting of 4 musical pieces. Two of the pieces in each concert had 17 Hz tones played underneath. ^{[60] [61]}

In the 2d concert, the pieces that were to carry a 17 Hz undertone were swapped so that examination results would non focus on any specific musical piece. The participants were not told which pieces included the depression-level 17 Hz well-nigh-infrasonic tone. The presence of the tone resulted in a significant number (22%) of respondents reporting feeling uneasy or sorrowful, getting chills downwardly the spine or nervous feelings of revulsion or fear. ^{[60] [61]}

In presenting the evidence to the British Association for the Advancement of Scientific discipline, Professor Richard Wiseman said "These results propose that low frequency sound can crusade people to have unusual experiences even though they cannot consciously detect infrasound. Some scientists have suggested that this level of sound may exist present at some allegedly haunted sites and and then cause people to have odd sensations that they attribute to a ghost—our findings support these ideas." ^[39]

Suggested human relationship to ghost sightings [ edit ]

Psychologist Richard Wiseman of the University of Hertfordshire suggests that the odd sensations that people attribute to ghosts may be caused by infrasonic vibrations. Vic Tandy, experimental officer and office-time lecturer in the school of international studies and law at Coventry Academy, along with Dr. Tony Lawrence of the University's psychology section, wrote in 1998 a newspaper called "Ghosts in the Machine" for the Journal of the Society for Psychical Research . Their enquiry suggested that an infrasonic signal of 19 Hz might be responsible for some ghost sightings. Tandy was working late 1 night alone in a supposedly haunted laboratory at Warwick, when he felt very broken-hearted and could detect a grey blob out of the corner of his eye. When Tandy turned to face the grey blob, in that location was naught.

The following solar day, Tandy was working on his fencing foil, with the handle held in a vice. Although at that place was zippo touching it, the bract started to vibrate wildly. Further investigation led Tandy to observe that the extractor fan in the lab was emitting a frequency of 18.98 Hz, very close to the resonant frequency of the eye given as eighteen Hz by NASA. ^[62] This, Tandy conjectured, was why he had seen a ghostly figure—it was, he believed, an optical illusion caused past his eyeballs resonating. The room was exactly half a wavelength in length, and the desk was in the heart, thus causing a standing wave which acquired the vibration of the foil. ^[63]

Tandy investigated this phenomenon further and wrote a paper entitled The Ghost in the Machine. ^[64] He carried out a number of investigations at various sites believed to exist haunted, including the basement of the Tourist Information Bureau adjacent to Coventry Cathedral ^{[65] [66]} and Edinburgh Castle. ^{[67] [68]}

Infrasound for nuclear detonation detection [ edit ]

Infrasound is one of several techniques used to identify if a nuclear detonation has occurred. A network of threescore infrasound stations, in addition to seismic and hydroacoustic stations, comprise the International Monitoring Organisation (IMS) that is tasked with monitoring compliance with the Comprehensive Nuclear Test-Ban Treaty (CTBT). ^[69] IMS Infrasound stations consist of viii microbarometer sensors and infinite filters arranged in an array covering an area of approximately i to ix kmⁱⁱ. ^{[69] [70]} The space filters used are radiating pipes with inlet ports along their length, designed to average out pressure level variations like wind turbulence for more precise measurements. ^[70] The microbarometers used are designed to monitor frequencies below approximately xx hertz. ^[69] Sound waves below 20 hertz have longer wavelengths and are not easily absorbed, assuasive for detection across large distances. ^[69]

Infrasound wavelengths can exist generated artificially through detonations and other human being activity, or naturally from earthquakes, severe weather condition, lightning, and other sources. ^[69] Similar forensic seismology, algorithms and other filter techniques are required to analyze gathered data and characterize events to determine if a nuclear detonation has actually occurred. Data is transmitted from each station via secure communication links for further assay. A digital signature is also embedded in the data sent from each station to verify if the data is authentic. ^[71]

Detection and measurement [ edit ]

NASA Langley has designed and developed an infrasonic detection system that can exist used to make useful infrasound measurements at a location where it was not possible previously. The system comprises an electret condenser microphone PCB Model 377M06, having a 3-inch membrane diameter, and a small, compact windscreen. ^[72] Electret-based technology offers the everyman possible background noise, because Johnson noise generated in the supporting electronics (preamplifier) is minimized. ^[72]

The microphone features a high membrane compliance with a big backchamber volume, a prepolarized backplane and a high impedance preamplifier located inside the backchamber. The windscreen, based on the high transmission coefficient of infrasound through thing, is fabricated of a fabric having a depression acoustic impedance and has a sufficiently thick wall to ensure structural stability. ^[73] Shut-cell polyurethane foam has been found to serve the purpose well. In the proposed test, examination parameters volition be sensitivity, background noise, betoken fidelity (harmonic distortion), and temporal stability.

The microphone design differs from that of a conventional sound system in that the peculiar features of infrasound are taken into business relationship. First, infrasound propagates over vast distances through the Earth's atmosphere every bit a result of very low atmospheric absorption and of refractive ducting that enables propagation by fashion of multiple bounces betwixt the Earth's surface and the stratosphere. A 2nd belongings that has received little attention is the great penetration capability of infrasound through solid affair – a property utilized in the design and fabrication of the organisation windscreens. ^[73]

Thus the organisation fulfills several instrumentation requirements advantageous to the application of acoustics: (i) a low-frequency microphone with specially low background noise, which enables detection of low-level signals within a depression-frequency passband; (two) a small, compact windscreen that permits (3) rapid deployment of a microphone assortment in the field. The system also features a data acquisition organization that permits real time detection, bearing, and signature of a depression-frequency source. ^[73]

The Comprehensive Nuclear-Test-Ban Treaty System Preparatory Commission uses infrasound equally one of its monitoring technologies, along with seismic, hydroacoustic, and atmospheric radionuclide monitoring. The loudest infrasound recorded to engagement by the monitoring system was generated by the 2013 Chelyabinsk meteor. ^[74]

In popular civilization [ edit ]

The 2017 picture The Sound uses infrasound equally a major plot element. ^{[75] [76]}

See too [ edit ]

• Bioacoustics
• Blaster axle
• Brown note
• Clear-air turbulence
• Contrabass tuba
• Feraliminal Lycanthropizer
• Havana Syndrome
• Helmholtz resonance
• The Hum
• Microbarom
• Sonic weapon
• Subcontrabass tuba
• Ultrasound

References [ edit ]

Notes

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2. ^ Wired Article, The Sound of Silence past John Geirland. 2006. Wired.com
3. ^ ^{a b c} "Gavreau", in Lost Science Archived 19 February 2012 at the Wayback Motorcar by Gerry Vassilatos. Signals, 1999. ISBN0-932813-75-5
4. ^ Gavreau V., Infra Sons: Générateurs, Détecteurs, Propriétés physiques, Effets biologiques, in: Acustica, vol. 17, no. i (1966), pp. ane–10
5. ^ Gavreau V., infrasound, in: Scientific discipline journal four(1) 1968, p. 33
6. ^ Gavreau V., "Sons graves intenses et infrasons" in: Scientific Progress – la Nature (Sept. 1968) pp. 336–344
7. ^ Garces, Chiliad.; Hetzer C.; Merrifield M.; Willis G.; Aucan J. (2003). "Observations of surf infrasound in Hawai'i". Geophysical Research Messages. thirty (24): 2264. Bibcode:2003GeoRL..30.2264G. doi:10.1029/2003GL018614. Comparison of ocean buoy measurements with infrasonic array information collected during the epic winter of 2002–2003 shows a clear human relationship between breaking body of water wave height and infrasonic indicate levels.
8. ^ Fee, David; Matoza, Robin S. (i January 2013). "An overview of volcano infrasound: From hawaiian to plinian, local to global". Periodical of Volcanology and Geothermal Research. 249: 123–139. Bibcode:2013JVGR..249..123F. doi:10.1016/j.jvolgeores.2012.09.002. ISSN0377-0273.
9. ^ Johnson, Jeffrey Bruce; Ripepe, Maurizio (15 September 2011). "Volcano infrasound: A review". Journal of Volcanology and Geothermal Inquiry. 206 (3): 61–69. Bibcode:2011JVGR..206...61J. doi:ten.1016/j.jvolgeores.2011.06.006. ISSN0377-0273.
10. ^ Garces, G.; Willis, One thousand. (2006). "Modeling and Characterization of Microbarom Signals in the Pacific". Archived from the original on eleven February 2009. Retrieved 24 November 2007. Naturally occurring sources of infrasound include (but are not express to) severe weather, volcanoes, bolides, earthquakes, mountain waves, surf, and, the focus of this research, nonlinear ocean wave interactions.
11. ^ Haak, Hein (1 September 2006). "Probing the Atmosphere with Infrasound : Infrasound equally a tool" (PDF). CTBT: Synergies with Scientific discipline, 1996–2006 and Beyond. Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization. Archived from the original (PDF) on ii July 2007.
12. ^ "Microbaroms". Infrasonic Signals. Academy of Alaska Fairbanks, Geophysical Institute, Infrasound Research Group. Archived from the original on 15 Feb 2008. Retrieved 22 November 2007. The ubiquitous five-second-menstruum infrasonic signals called "microbaroms", which are generated past continuing body of water waves in marine storms, are the crusade of the low-level natural-infrasound background in the passband from 0.02 to x Hz.
13. ^ "NOAA ESRL Infrasonics Plan" . Retrieved 10 Apr 2012.
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16. ^ Eastward.Thousand. von Muggenthaler, J.W. Stoughton, J.C. Daniel, Jr.: Infrasound from the rhinocerotidae , from O.A. Ryder (1993): Rhinoceros biology and conservation: Proceedings of an international conference, San Diego, U.S.A. San Diego, Zoological Guild
17. ^ ^{a b} von Muggenthaler, Elizabeth (2003). "Songlike vocalizations from the Sumatran Rhinoceros (Dicerorhinus sumatrensis)". Acoustics Research Letters Online. 4 (three): 83. doi: 10.1121/1.1588271 . . Besides cited by: West Marrin: Infrasonic signals in the environs , Acoustics 2004 Briefing
18. ^ E. von Muggenthaler, C. Baes, D. Hill, R. Fulk, A. Lee: Infrasound and low frequency vocalizations from the giraffe; Helmholtz resonance in biology Archived xv February 2012 at the Wayback Machine, proceedings of Riverbanks Consortium on biology and behavior, 1999. Also piece of work by Muggenthaler et al cited by Nicole Herget: Giraffes, Living Wild, Creative Education, 2009, ISBN978-one-58341-654-ix, p. 38
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27. ^ Richardson, Greene, Malme, Thomson (1995). Marine Mammals and Dissonance. Academic Press. ISBN 978-0-12-588440-2 . {{cite book}}: CS1 maint: multiple names: authors list (link)
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29. ^ Garstang, Michael (ane January 2010), Brudzynski, Stefan Thou. (ed.), "Chapter three.ii - Elephant infrasounds: long-range communication", Handbook of Behavioral Neuroscience, Handbook of Mammalian Vocalism, Elsevier, vol. xix, pp. 57–67, retrieved 27 January 2022
30. ^ Hsu, Christine (24 August 2012). "Man With Earth'due south Deepest Voice Hits Notes That Just Elephants Can Hear". Medical Daily . Retrieved ii August 2016. American vocalist Tim Storms who also has the world's widest vocal range can reach notes every bit low as G-seven (0.189Hz) [...] then low that even Storms himself cannot hear it.
31. ^ Chen, C.H., ed. (2007). Signal and Image Processing for Remote Sensing . Boca Raton: CRC. p.33. ISBN 978-0-8493-5091-7 .
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39. ^ ^{a b} "Infrasound linked to spooky effects". NBC News. vii September 2003.
40. ^ King, Simon (12 June 2015). "Air current subcontract effect on balance 'akin to seasickness': scientist". News Corp Australia.
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48. ^ The Pentagon considers ear-blasting anti-hijack gun — New Scientist
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Bibliography

• Gundersen, P. Erik. The Handy Physics Answer Book. Visible Ink Press, 2003.
• Chedd, Graham. Sound; From Communications to Racket Pollution. Doubleday & Company, 1970.
• O'Keefe, Ciaran, and Sarah Angliss. The Subjective Effects of Infrasound in a Alive Concert Setting. CIM04: Conference on Interdisciplinary Musicology . Graz, Austria: Graz UP, 2004. 132–133.
• Discovery'south Biggest Shows aired at 8:00 pm (Indian Standard Time) on The Discovery Aqueduct, India on Sunday, 7 October 2007

External links [ edit ]

Look up infrasound in Wiktionary, the free dictionary.

• Inframatics, an international infrasound monitoring organisation
• NOAA Infrasonics Program
• United states Army Space and Missile Defense Command Monitoring Research Program
• Los Alamos Infrasound Monitoring Laboratory
• Infrasonic and Audio-visual-Gravity Waves Generated by the Mount Pinatubo Eruption of 15 June 1991, Makoto Tahira, Masahiro Nomura, Yosihiro Sawada and Kosuke Kamo
• Sub-surface windscreen for the measurement of outdoor infrasound Qamar A. Shams, Cecil G. Burkett and Toby Comeaux NASA Langley Research Center, Allan J. Zuckerwar Analytical Services and Cloth, and George R. Weistroffer Virginia Republic University

Strange Animal Noise That Sounds Like a Turbo Booster

Source: https://en.wikipedia.org/wiki/Infrasound