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Volcano-Like Tremors Detected Deep within Earth's Crust Near San Andreas

 
Marlboro Man
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04/13/2006 01:30 PM
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Volcano-Like Tremors Detected Deep within Earth's Crust Near San Andreas
Volcano-Like Tremors Detected Deep within Earth's Crust Near San Andreas

12-Apr-2006

Newswise Tremors within the Earth are usually--but not always--related to the activity of a volcano. Now, such vibrations have been recorded nowhere near a volcano, but at a geologic observatory at the San Andreas Fault. Scientists believe the fault tremors may be related to activity at a subduction zone--a place where one of Earth's constantly moving tectonic plates slips beneath another.

To determine whether the San Andreas Fault is moving with the tremors, scientists with the San Andreas Fault Observatory at Depth (SAFOD) are installing instruments to measure the tremors' activity. Located near Parkfield, Calif., SAFOD is part of the EarthScope Project, an effort to study the North American continent's geology.

"Unlike the sharp jolt of an earthquake, tremors within Earth's crust emerge slowly, rumbling for longer periods of time," said Kaye Shedlock, program director for EarthScope at the National Science Foundation (NSF), which funds the project. "Although not in this case, tremors are usually produced by magma moving in cracks or other conduits beneath a volcano."

The rumblings are the first recordings of non-volcanic tremors in a deep borehole, providing scientists with data to better understand such mysterious underground movements.

The results will help geologists understand whether the deeply buried rocks of the San Andreas Fault - which are derived from an ancient subduction zone - behave in a similar way to the rocks of the Cascadia Subduction Zone, still active today.

"In the Cascadia Subduction Zone off the Pacific Northwest, for example, tremors are associated with the slow slip of the undersea Juan de Fuca tectonic plate as it submerges beneath the North American tectonic plate," said Greg van der Vink, EarthScope facility project director.

[link to www.newswise.com]
Rev. Star Gazer

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04/13/2006 01:31 PM
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Re: Volcano-Like Tremors Detected Deep within Earth's Crust Near San Andreas
Could that be what caused the San Diego booms? damned
"The lunatic is on the grass
The lunatic is on the grass
Remembering games and daisy chains and laughs
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Black Viper Rex

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04/13/2006 01:33 PM
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Re: Volcano-Like Tremors Detected Deep within Earth's Crust Near San Andreas
Wow. The Earth is growing.
Do not believe anything I say.
Rev. Star Gazer

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04/13/2006 01:34 PM
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Re: Volcano-Like Tremors Detected Deep within Earth's Crust Near San Andreas
It's a big egg getting ready to crack!
"The lunatic is on the grass
The lunatic is on the grass
Remembering games and daisy chains and laughs
Got to keep the loonies on the path..."
Marlboro Man  (OP)

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04/13/2006 01:45 PM
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Re: Volcano-Like Tremors Detected Deep within Earth's Crust Near San Andreas
I've been wondering about those "booms" down south as well Rev, that one is still anybodies guess. I've said for a long time that although the Ca. coast is a mainly a strike slip zone, that the Sierras were created by a massive subduction event by a deeper set of plates. It seems for the last year now that they've been finding more evidence related to a deep subductive plate.
neti
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04/13/2006 05:57 PM
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Re: Volcano-Like Tremors Detected Deep within Earth's Crust Near San Andreas
bump..





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