Infrasound, sometimes referred to as low frequency sound or incorrectly subsonic (subsonic being a descriptor for "less than the speed of sound"), [1] describes sound waves with a frequency below the lower limit of human audibility (generally 20 …

Les infrasons sont des ondes sonores de basse fréquence ; ce sont donc à la fois des vibrations mécaniques et des oscillations acoustiques.

Monitoring of infrasound seems to be one of the best ways for detecting atmospheric nuclear tests. As of 2004 there were 24 such monitoring stations out of a projected total of 60. While no nuclear tests have been detected, in 2003 10 stations in the U.S. and Canada monitored the explosion of the space shuttle Columbia.

Infrasound, in its popular definition as sound below a frequency of 20 Hz, is clearly audible, the hearing threshold having been measured down to 1.5 Hz. The popular concept that sound below 20 Hz is inaudible is not correct. Sources of infrasound are in the range from very low-frequency atmospheric fluctuations up into the lower audio frequencies.

2024年10月18日 · What do a wind turbine, an ocean swell, and a volcanic eruption have in common? All three emit infrasound, or sound whose frequency is below 20 hertz. These sound waves, which are wrongly considered to be inaudible, can travel around the Earth multiple times, and are of interest to both physicists and doctors. A closer look.

2025年2月21日 · infrasonics, vibrational or stress waves in elastic media, having a frequency below those of sound waves that can be detected by the human ear —i.e., below 20 hertz. The range of frequencies extends down to geologic vibrations …

2023年11月21日 · Infrasound is the sound with a vibration frequency that is lower than the detectable limit for humans. Sound is an oscillating pressure wave that is created by vibrating matter....

2007年1月1日 · Infrasound, in its popular definition as sound below a frequency of 20 Hz, is clearly audible, the hearing threshold having been measured down to 1.5 Hz. The popular concept that sound below 20 Hz is inaudible is not correct. Sources of infrasound are in the range from very low-frequency atmospheric fluctuations up into the lower audio frequencies.

2012年1月5日 · Infrasonics refers to sound at frequencies below the limit of human hearing, typically below 20 Hz. You might find these chapters and articles relevant to this topic. Allan J. Zuckerwar, in Encyclopedia of Physical Science and Technology (Third Edition), 2003. Having no reflections or echoes.

Infrasound and ultrasound are wavelengths that the human ear cannot perceive, while they are heard and used by many animals.