infraäänitasoille
Infrasound refers to sound waves with frequencies below the lower limit of human audibility, generally considered to be 20 Hertz (Hz). While humans cannot consciously hear infrasound, it can be perceived as vibrations or pressure changes. Sources of infrasound are varied and include natural phenomena such as earthquakes, volcanic eruptions, avalanches, and strong winds. Man-made sources include large industrial machinery, wind turbines, internal combustion engines, and even some types of aircraft.
The intensity of infrasound is often measured in decibels (dB) on a linear scale, as opposed to