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Obsidian flow

Subject: Obsidian flow
From: "oskargypsy" oskargypsy
Date: Fri Feb 8, 2013 6:24 am ((PST))
An interesting piece on the sound of obsidian (a natural glass like substan=
ce) still flowing a year after it had been erupted in Chile.
Not recorded, unfortunately.
http://earthobservatory.nasa.gov/IOTD/view.php?id=3D80330

"A team of geologists visiting Puyehue in January 2013 discovered that the =
lava was still in motion even though the eruption had stopped. Unlike a cry=
stalline rock, obsidian is not completely rigid: it can flow, even when sol=
id. The higher the temperature, the faster a glass will deform, especially =
near its melting point. Volcanologist Hugh Tuffen described his experience =
approaching the flow: "The sound of advancing obsidian lava is quite fascin=
ating and unlike anything I have ever heard=97a succession of platey fractu=
ring sounds, as if a bowl of rice crispies were made up of thousands of fra=
gile plates that each broke, rather than the usual snap, crackle and pop." =
The hot interior of the lava flow, insulated by a shell of solidified rock,=
 allowed it to continue to ooze downhill."










"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.



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