The term "infrasonic" applied to sound refers to sound waves below the frequencies of audible sound, and nominally includes anything under 20 Hz. Ultrasonic and Infrasonic Waves Ultrasonic sound waves are fast moving waves that can not usally be herd by the human ear. However, children under 5 years of age can hear the sound upto 25000 Hz. See more. Humans can't hear infrasound, which scientists define as any sound pitched below 20 hertz to as low as 2 hertz. HTRZ stands for number of vibrations per second. Animals that can hear infrasonic sounds are; frogs. Lower sounds, in other words frequencies of 2-16 Hz, are called infrasonic. Sources of infrasound in nature include volcanoes, avalanches, earthquakes and meteorites. Indeed, infrasonic sound is still bound by the law of physics. elephants) present conspicuous examples of potential use of infrasound in the context of communication, the extent to which airborne infrasound perception exists among terrestrial animals is unclear. ... A number of animals produce and use sounds in the infrasonic range. Infrasound is produced because of very slow vibration. Want to test your own hearing? A recent example of this is the 2004 Indian Ocean earthquake and tsunami. Infrasound is sound that is lower in frequency than 20 Hz (Hertz) or cycles per second, the normal limit of human hearing.Hearing becomes gradually less sensitive as frequency decreases, so for humans to perceive infrasound, the sound pressure must be sufficiently high. See more. Sound and vision Before we talk about infrasound, or any sound, it's probably useful to discuss just exactly how the sense works. Frequencies above 20,000 Hz are in the ultrasonic range. It sounds like science fiction, but infrasonic weapons are science fact. whales and elephants. pigeons. what animals can use infrasonic sound? Despite there bing many references to acoustic weaponry, as early as World War 2, it is in the 1960’s that actual documented research becomes more available. The vehicle for the provision of this information is called a signal. While animals that produce vocalizations with infrasonic components (e.g. michael971. sound waves that have a frequency that is lower than what humans can hear (i.e. ants. Sound at frequencies below 20 Hz, called “infrasound”, are ultra low frequencies that we Other animals, such as elephants, whales and rhinos, perceive infrasonic sounds as vibrations, and even communicate with each other at this level of sound. The correct measurement would be 20,000 HTRZ. 1 decade ago. Infrasound is sound that is below the lower limit of human hearing, below 20 Hz, and ultrasound is above the upper limit of human hearing, above 20,000 Hz.Infrasonic Sound has a frequency less than the audible frequency range. Eventually they determined the infrasonic waves from the motor caused a resonance within the building. Infrasound is a sound below the range of human hearing. 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