infrasound

The word acoustics takes root from the Greek word akoustos meaning 'audible' although modern acoustics also includes inaudible mechanical vibrations, infrasound and ultrasound.

This can change the infrasound emitted by the volcano.

Ahead of her talk in Co Tyrone next week, she said: "Our research into the biological effects of infrasound and low frequency noise began in 1980.

Specific details such as the discovery that giraffes are social creatures that are able to communicate via infrasound (vocal noises that can travel long distances but are so low that they cannot be heard by humans) help to connect the reader to each individual giraffe.

If the air pressure changes have major frequency components below 20 Hz, which is below our normal hearing range, it is called "infrasound." With infrasound, our bodies respond differently than we do for audible sound.

In Paracoustics, Parsons and Cooper have drawn together a collection of chapters that review what is known about these kinds of anomalous sounds, as well as phenomena such as infrasound and electronic voice phenomena that cannot be heard by the unaided ear yet can be studied using electronic equipment.

He offers a framework for understanding the body and its capacity to interact with sound shaped by low-frequency vibrations, and discusses encounters with unheard vibration like infrasound and other sound-like modulations of natural or industrial origin; religious uses of low-frequency sound in history; and recent secular creative practices that explore the potential of low-frequency sonic experience, such as in art and bass cults.

ISLAMABAD -- NASA recently recorded mysterious noises,called "alien sounds," using infrasound microphones on a student balloon project, Scientists.

with a microphone designed to pick up on infrasound, noises below 20 Hertz that cannot be heard by human ears, Telegraph reported.

For example, where measuring infrasound typically required large, fire extinguisher size devices, UAF inventors have created small and low power infrasound microphone, making the technology useful for new applications.

We know that Swifts will move hundreds of miles ahead of a weather front to avoid it, but the American research suggests the Warblers knew of the impending tornadoes by infrasound, which travels through the ground.

But Jodie was there; she saw everything unfold as her father experimented with infrasound waves - low-frequency sounds that humans cannot hear - as part of his academic research on the paranormal.