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Topic: Infrasound

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	ASA 149th Meeting Lay Language Papers -Infrasound associated with the 2004 Sumatra megathrust earthquake and tsunami
		The infrasound stations observed (1) seismic arrivals (P, S and surface) from the earthquake, (2) Tertiary arrivals (T-phases), propagated along SOFAR channel in the ocean, and coupled back to the ground, and (3) infrasonic arrivals associated with either the tsunami generation mechanism or the motion of the ground above sea level.
		Infrasound, which by definition is below the 20Hz human hearing threshold, is made audible by speeding it up by 200x, and the relative amplitudes of the three signals have been rescaled to maximize their volume.
		The arrival of the tsunami was not observed by the infrasound stations.
	www.aip.org /149th/garces.html (425 words)

	Infrasound - Wikipedia, the free encyclopedia
		Infrasound is sound with a frequency too low to be detected by the human ear.
		Infrasound can also be generated by man-made processes such as explosions, both chemical and nuclear.
		Whales, elephants, rhinoceros, giraffes, okapi, and alligators are known to use infrasound to communicate over varying distances of up to many miles as in the case of the whale, for instance.
	en.wikipedia.org /wiki/Infrasound (799 words)

	Infrasound
		The mystery was unsolved for decades, until it became clear that infrasound was the explanation of the phenomenon.
		But infrasound of seven hertz is terrible for people: they may go mad and throw themselves overboard to save their lives.
		Physicists studying effect of infrasound upon the human body say that volunteers participating in their experiments complain of weariness, high pressure in the eyes and in the ears, but never mention hallucinations or ghosts.
	ghosts.monstrous.com /infrasound.htm (852 words)

	Infrasound by John D. Cody
		It is believed that infrasound actually formed the upper pitch of this natural volcanic explosion, tones unmeasurably deep forming the actual "central harmonic" of the event.
		Infrasounds associated with the Aurora Borealis are too numerous to mention, a well chronicled occurrence.
		Atmospheric infrasound is most strongly measured during daytime hours, a clear indication of their source in the intermittent expulsions of solar wind.
	www.borderlands.com /newstuff/research/infra.htm (3657 words)

	Infrasound by John D. Cody (Site not responding. Last check: )
		It is believed that infrasound actually formed the upper pitch of this natural volcanic explosion, tones unmeasurably deep forming the actual "central harmonic" of the event.
		Infrasounds associated with the Aurora Borealis are too numerous to mention, a well chronicled occurrence.
		Atmospheric infrasound is most strongly measured during daytime hours, a clear indication of their source in the intermittent expulsions of solar wind.
	trauma.cofa.unsw.edu.au /Infrasound/infra.htm (3657 words)

	infrasound
		Infrasound refers to extreme bass waves or vibrations, those with a frequency below the audibility range of the human ear (20 Hz to 22 kHz).
		"Loud infrasound in the range of 0.5 to 10 Hz is sufficient to activate the vestibular, or balance system, in the inner ear."* Psychologist Richard Wiseman of the University of Hertfordshire thinks that the odd sensations that people attribute to ghosts may be caused by infrasonic vibrations.
		Infrasound may be produced by wind, by some types of earthquakes, by ocean waves, and by such things as avalanches, volcanoes, and meteors.
	skepdic.com /infrasound.html (475 words)

	Infrasonic Sound (Site not responding. Last check: )
		Early studies of infrasound of hurricanes offer some hope of deciphering the infrasound signature of an approaching hurricane.
		Infrasound detectors are used in Teton Pass, Wyoming to detect the frequent avalanches and send warning signals.
		Auroral phenomena generate infrasound by the expansion of air accompanying the electrical discharges.
	hyperphysics.phy-astr.gsu.edu /hbase/sound/infrasound.html (313 words)

	What is Infrasound?
		Infrasound is sound with a frequency too low to be detected by humans.
		Infrasound can be thought of as a slow, periodic rumbling - it is generated by large processes such as avalanches, volcanoes, tornadoes, ocean waves, earthquakes, and meteors.
		Infrasound is at the right frequency to wreak havoc upon fragile objects like glass windows and household trinkets.
	www.wisegeek.com /what-is-infrasound.htm (382 words)

	Reports, Infrasound Research Group
		Infrasound from Erebus Volcano at I55US in Antarctica
		Infrasound signals that are associated with auroral activity have been observed at Fairbanks over the past 30 years with infrasonic microphone arrays operated with both analogue and digital data acquisition systems.
		This radiated infrasound was highly anisotropic propagating as a bow wave moving in the same direction as that of the auroral arc.
	www.gi.alaska.edu /infrasound/Infrasound24.htm (3188 words)

	Avalanches, Infrasound Research Group
		Infrasound from the launch on Feb. 6, 2002 of a Black-Brandt rocket at the Poker Flat Rocket Range 34 km to the north of I53US.
		Infrasound from a helicopter over flight showing the pressure signal wave train and its spectrogram showing the Doppler shifted frequency of the signal.
		Infrasound from the crash of a British jet aircraft 300 km east of Fairbanks July 25, 2001.
	www.gi.alaska.edu /infrasound/Infrasound257.htm (1384 words)

	Infrasound (Site not responding. Last check: )
		Infrasound is produced by a variety of sources, from hurricanes and the northern lights to elephants and rhinoceroses to nuclear device testing.
		Infrasound detection gained heightened interest in the beginning of the Cold War, when nuclear testing began to be closely monitored.
		Others are interested in how infrasound technology may lead to better forecasting of the weather, or the ability to predict occurrences like avalanches and volcanoes.
	amos.indiana.edu /library/scripts/infrasound.html (242 words)

	SMU NVAR and TXAR Infrasound of Space Shuttle Columbia
		Southern Methodist University seismologists Gene Herrin and Petru Negraru analyze the infrasound signals from the TXAR and NVAR arrays of the re-entry of the Space Shuttle Columbia, 01 February, 2003.
		Here are infrasound records from the NVAR array in Mina, Nevada, and the TXAR array in Lajitas, Texas, of the re-entry of the Space Shuttle Columbia on 01 February, 2003.
		The infrasound data from the Columbia mission appear to be a superimposition of similar N-wave induced acoustic signals, plus the sharp arrivals from an explosive event as modeled in the simulations.
	www.geology.smu.edu /~dpa-www/columbia (906 words)

	Gavreau's Infrasound Weapons (Site not responding. Last check: )
		Nazi propaganda engineers methodically used infrasound to stir up the hostilities of crowds who were gathered to hear their madman.
		Infrasound could not adequately be blocked, as Dr. Gavreau discovered early in his research.
		Infrasounds saturate their generators, flooding and permeating their sources in a few seconds.
	trauma.cofa.unsw.edu.au /Infrasound/Gavreau.html (4385 words)

	BBC NEWS \| Science/Nature \| Organ music 'instils religious feelings'
		But in a controlled experiment in which infrasound was pumped into a concert hall, UK scientists found they could instil strange feelings in the audience at will.
		Infrasound can be detected at volcanoes and may provide a way to predict eruptions.
		Details of the organ infrasound study are being presented to the British Association's annual science festival, which this year is in Salford, Greater Manchester.
	news.bbc.co.uk /2/hi/science/nature/3087674.stm (518 words)

	Ghosts and infrasound
		Lord and his colleagues, who produced infrasound with a seven meter (yard) pipe and tested its impact on 750 people at a concert, said infrasound is also generated by natural phenomena.
		In the first controlled experiment of infrasound, Lord and Wiseman played four contemporary pieces of live music, including some laced with infrasound, at a London concert hall and asked the audience to describe their reactions to the music.
		Infrasound is also produced by storms, seasonal winds and weather patterns and some types of earthquakes.
	www.meta-religion.com /Paranormale/Ghost/ghosts_and_infrasound.htm (408 words)

	Infrasound From the Giraffe
		Infrasound is useful for communicating in dense forest as well and for long-distance communication on the open savanna.
		Infrasound would be well suited to this type of communication much as it has been demonstrated to be for elephants.
		Infrasound can travel virtually unimpeded for great distance; the signals can be interrupted or jumbled because of other sources of infrasound such as large generators, trains, freeways and other man made objects.
	www.animalvoice.com /Giraffe.htm (2561 words)

	Health & Medical News - The fear of 'haunted' houses explained - 08/09/2003
		Lord and colleages, who produced infrasound with a seven metre pipe and tested its impact on 750 people at a concert, said infrasound is also generated by natural phenomena.
		In the first controlled experiment of infrasound, Lord and Wiseman played four contemporary pieces of live music, including some laced with infrasound, at a London concert hall and asked the audience to describe their reactions to the music.
		Infrasound is also produced by storms, seasonal winds and weather patterns and some types of earthquakes.
	www.abc.net.au /science/news/health/HealthRepublish_941414.htm (461 words)

	Barbelith Underground > Laboratory > Infrasound the True Cause of Ghost-Like Sensations?
		Lord and his colleagues, who produced infrasound with a seven meter (yard) pipe and tested its impact on 750 people at a concert, said infrasound is also generated by natural phenomena.
		One cause of infrasound in haunted buildings is wind passing over the top of a chimney with a blocked off fireplace.
		I first heard of the impact of infrasound as a cause of illusions when an engineer (Vic Tandy) reported seeing apparitions while working on his computer in a semidark office with a faulty extractor fan (the measured frequency was 19Hz) (See http://www.livesoundint.com/archives/2002/janfeb/low/low.php)
	www.barbelith.com /topic/14012 (1366 words)

	Sonic boom \| \| Guardian Unlimited Arts
		The big brother of ultrasound, infrasound means frequencies too low to be heard by the human ear.
		Some birds can hear infrasound, which is one explanation for their ability to predict storms.
		Even before you hit infrasound, lower frequencies can have a heightened emotional effect: the wavelengths are too long for us to pinpoint, adding a sense of uncertainty.
	arts.guardian.co.uk /fridayreview/story/0,12102,956495,00.html (731 words)

	PhysOrgForum Science, Physics and Technology Discussion Forums -> Linking Gravitomagnetism to Infrasound
		Infrasound is sound below normal hearing range of 20hz that occurs in nature such as earthquakes, thunderstorms, Northern Lights, meteor showeres, wave action, wind, etc. Infrasound is a topic of great interest to researchers.
		My thought is that if infrasound has a very subtle magnetic component to it, some of these anomalies may be explained especially in understanding the dynamics of thunderstorms that create vortices, lightning discharges, and lately in the news, gamma ray release.
		My thought is that the link between infrasound and gravitomagnetism may be that when infrasound is created by natural or manmade events, this is the tell in the sound medium that a maximum value (peak value) of a gravitomagnetic field has been achieved by the moving/vibrating object.
	forum.physorg.com /index.php?showtopic=1764&st=0 (2314 words)

	NATURE. Featured Program. Tall Blondes. Silent Sentinels? \| PBS
		These low-pitched sounds are known as "infrasound," and they have at least one remarkable property: they can travel farther than higher-pitched noises through the air and earth.
		But by doing studies in zoos, where researchers can partly control experiments, scientists have been able to document the existence of infrasound and show that animals appear to be using it to communicate.
		In part, Muggenthaler had taken on the study -- done on 11 giraffes at 2 zoos in North and South Carolina -- because she had studied the use of infrasound by the Okapi, a relative of the giraffe.
	www.pbs.org /wnet/nature/tallblondes/infrasound.html (337 words)

	Healing Music Organization - Infrasound: Healing Sound Waves
		Therapeutic infrasound produces alpha sound waves in the approximate range of 8 to 14Hz in a multiple, random, chaotic signal.
		Infrasound is inaudible to the human ear and can travel great distances without distortion.
		Ronald J. Riegel, a doctor of veterinary medicine, studied infrasound's effects on 10 racehorses that had chronic inflammation of the hocks (the equivalent of a person's ankles).
	www.healingmusic.org /Library/Newsroom/InfrasoundHealingSoundWaves.asp (1515 words)

	Anemaw [Animal Electromagnetism and Waves] : Infrasound and Seismic Communication Waves . © Elizabeth Gerrow 2002 .
		Infrasound, therefore, is a vibration with frequencies composed of short wavelengths, which travel for long distances through air and particularly through earth, where deeper infrasound travels further.
		The study of infrasound waves may be known as "infrasonics" or "infra acoustics", a contemporary study in both biological and geological sciences (11).
		Present in the measurements of infrasound, there is a 63.0 dB difference between the two scales, where 26.0 dB of the difference is attributed to the conventional choice of sound reference level: in air, the reference level is 20.0 microPascals where in water, the level is 1.0 microPascal.
	members.fortunecity.com /anemaw/infrasonic.htm (1817 words)

	www.amateurgeophysics.com - Infrasound (Site not responding. Last check: )
		Infrasound is generally regarded as sound that is below the low-frequency threshold of human hearing of 20 Hz.
		The low frequency limit of infrasound is a little fuzzy but might extend out to periods of 500 to 1000 seconds.
		Infrasound research has a long but sporadic history until the last several years when it has experienced resurgence as a component in the worldwide monitoring system to enforce the Comprehensive Nuclear Test Ban Treaty.
	www.bright.net /~lems/infrasound/infrasound1.htm (336 words)

	Infrasonic - experiments with music, video and extreme bass sound. (Site not responding. Last check: )
		Psychologists and musicologists share a fascination with the emotional effects of infrasound but generally, in their research profiles, have let it fall between the cracks (leaving conspiracy theorists populating the internet, free to sweep up – and reassemble - the bits).
		Infrasound shouldn’t be confused with the more familiar term ‘ultrasound’;, which refers to sound above 20kHz, the upper limit of human hearing.
		To establish whether infrasound is causing strange experiences, rather than simply correlating with them, we need to generate infrasound in a controlled way.
	www.spacedog.biz /infrasonic/background.htm (2174 words)

	Infrasound
		Infrasound is especially dangerous, due to its strong vibrations, or oscillations.
		Infrasound disrupts the normal functioning of the middle and inner ear, leading to nausea, imbalance, impaired equilibrium, immobilization, and disorientation.
		Infrasound Toxicological Summary, November 2001 - "When male volunteers were exposed to simulated industrial infrasound of 5 and 10 Hz and levels of 100 and 135 dB for 15 minutes, feelings of fatigue, apathy, and depression, pressure in the ears, loss of concentration, drowsiness, and vibration of internal organs were reported.
	www.lowertheboom.org /trice/infrasound.htm (2810 words)

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