Science Diary: Volcano - Silence: The Pulse of the Planet daily radio program offers free legal online mp3 downloads, exploring the world of sound in nature, culture and science, with audio adventures, world music, extraordinary sound portraits, science diaries, and nature ring-tones; an amazing sonic experience.



Airdate: Jul 14, 2008
Scientist: Milton Garces, Ph.D.

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 EARTH SCIENCE ,Volcanoes ,Acoustics ,sound


Science Diary: Volcano - Silence

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With low-frequency volcano sound, it's a deafening silence, quite literally.
Transcript:

music; ambience

Its one of the loudest things in this whole island. This thing is louder than the ocean, this thing is louder than anything else around it. In terms of human perception, you can stand right by it, and you don't hear a thing.

A loud sound that you cant hear? Welcome to Pulse of the Planets Science Diaries, a glimpse of the world of science from the inside. Milton Garces monitors volcanic activity by recording low frequency sounds that volcanoes produce: theyre loud, but their frequencies of vibration measured in cycles per second, are so low that humans cant hear them.

The most interesting thing and fascinating part about the ongoing eruption is the massive amounts of low frequency sound that are about one cycle every two seconds. This is a very slow process. It's a really deep volcanic signal.

ambience: Peles chant

By recording this signal and speeding up the recording 100 times, the sounds become audible.

Were listening to whats been nicknamed Peles Chant, eruptive activity deep inside Kilauea Volcano. It is heard through a new vent in the Halemaumau crater, which lies within Kilauea, home to Pele, the volcano goddess of ancient Hawaiian legend.

The way we interpret this Halemaumau signal is that it connects the surface, the atmosphere to a deep chamber, gas at the bottom, when it reaches the atmosphere, it rings on its way up, it's like listening to a flute that's embedded inside the volcanic system.

Check out Milton Garces blog on Pulseplanet.com.

Pulse of the Planets Science Diaries are made possible by the National Science Foundation.







 
Science Diary: Volcano - Silence