infrasoundsubsonic

Infrasound is defined as sound waves with frequencies below the lower limit of human audibility, which is typically around 20 Hertz (Hz). These very low-frequency sounds are inaudible to humans, meaning we cannot consciously hear them. The term infrasonic refers to phenomena or objects operating at these frequencies. Infrasound can be generated by a variety of natural and artificial sources.

Natural sources of infrasound include earthquakes, volcanic eruptions, avalanches, severe weather events like thunderstorms and hurricanes, and even the movement of large ocean waves. Large animals such as elephants and hippopotamuses are known to produce infrasound for communication over long distances.

Artificial sources of infrasound are also numerous. These can include industrial machinery, wind turbines, explosions, sonic booms from aircraft, and certain types of vehicles. Traffic and even human activities like coughing can produce infrasound, though at much lower levels.

While humans cannot hear infrasound, some research suggests it might be perceived in other ways, potentially causing feelings of unease, anxiety, or even physiological effects in some individuals, although the scientific consensus on these perceptual or physiological impacts is still developing. The study of infrasound is important for various fields, including seismology, meteorology, acoustics, and environmental monitoring.