Infrasound
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Infrasound, sometimes referred to as low frequency sound or subsonic, describes sound waves with a frequency below the lower limit of human audibility. Hearing becomes gradually less sensitive as freq
Infrasound arrays at a monitoring station in Qaanaaq, Greenland
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 not readily capable
Dyatlov Pass incident
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The Dyatlov Pass incident was an event in which nine Soviet ski hikers died in the northern part of the Ural Mountains ridge in the Russian SFSR on 1 or 2 February 1959 under undetermined circumstance
Infrasound
…changes, such as cell changes and ruptured blood vessel walls. Infrasound is one hypothesized cause of death for the nine Soviet hikers who were found dead at Dyatlov Pass in 1959. US: Maximum levels for frequencies from 1 to 80 Hz are no more than 145 dB. Overall level (for all frequencies) is no more than 150 dB…
The group's tomb at the Mikhailovskoe Cemetery in Yekaterinburg, Russia, in 2012
A view of the tent as the rescuers found it 26 February 1959. The tent had been cut open from the inside, and most of the hikers had fled in socks or barefoot.
Tomb of the deceased at Mikhailovskoe Cemetery in Yekaterinburg, Russia