Infrasound by Erin and Matt.ppt

8/18/2019 Infrasound by Erin and Matt.ppt

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Erin Bastick

Matthew Shaw


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Infrasound refers to extreme bass wavesor vibrations, those with a frequencybelow the audibility range of the human

ear These sounds have a frequency from !

"# to k"#$


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Infrasound occurs in sever weather,tsunamis, volcanoes, earthquakes,waterfalls, calving of icebergs, and

lightning$ Ele%hants are ca%able of %roducing

infrasound that is detectable u% to km,and whales can be detectable hundreds of

km&s away$ 'hales, ele%hants, hi%%otamuses,

rhinoceros, gira(es, oka%i, and alligatorsare known to use infrasound$


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Some man made infrasound %roducingoccurrences are sonic booms, ex%losions,diesel engines, wind turbines, and

subwoofers$


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Infrasound was used by )llied forces in'orld 'ar * to locate artillery$

+ladimir avreau, -ussian born scientist,

was the %ioneer of infrasound research$


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./n May 0*, !!0, a team of 12 researchers held a massex%eriment where they ex%osed some 3!! %eo%le to music lacedwith soft *3 "# sine waves %layed at a level described as 4nearthe edge of hearing4, %roduced by an extra5long stroke sub5woofer mounted two5thirds of the way from the end of a seven5

meter5long %lastic sewer %i%e$ The ex%erimental concert 6entitledInfrasonic7 took %lace in the 8urcell -oom over the course of two%erformances, each consisting of four musical %ieces$ Two of the%ieces in each concert had *3 "# tones %layed underneath$ In thesecond concert, the %ieces that were to carry a *3 "# undertonewere swa%%ed so that test results would not focus on any s%eci9c

musical %iece$ The %artici%ants were not told which %iecesincluded the low5level *3 "# near5infrasonic tone$ The %resence ofthe tone resulted in a signi9cant number 6:7 of res%ondentsre%orting anxiety, uneasiness, extreme sorrow, nervous feelingsof revulsion or fear, chills down the s%ine and feelings of %ressureon the chest$; )ccording to htt%


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htt%d%a5www=columbia=geotech?dallas$@%g

htt%

Infrasound by Erin and Matt.ppt

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