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Infrasound,
sometimes referred to as low
frequency sound,
describes sound waves with a
frequency below the
lower limit of
human audibility (generally 20...
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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...
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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...
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including animal attacks, hypothermia, an avalanche,
katabatic winds,
infrasound-induced panic,
military involvement, or some
combination of
these factors...
- engineer. He was
known best for his
research into the
relationship between infrasound and
ghostly apparitions.
During 2001
Tandy was
asked to
investigate the...
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genre conventions. In a
study by
Medes et al.,
prolonged exposure to
infrasound and low-frequency
noise (<500 Hz) in long
durations has an
effect on vocal...
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increase intelligibility by
condensing them and
raising the
frequency from
infrasound to a more
audible and
reproducible range. The
following unidentified sounds...
- a newly-installed
extractor fan,
found by Tandy, that was
generating infrasound of 18.9 Hz, 0.3 Hz, and 9 Hz. A long-range
acoustic device (LRAD) produces...
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detect a
nuclear detonation,
these include seismic, hydroacoustic, and
infrasound detection, air sampling, and satellites. They have
their own weaknesses...
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yield of 400–500
kilotonnes of TNT (1.7–2.1 petajoules),
estimated from
infrasound and
seismic measurements. This was approx. 30
times as much
energy as...
