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Jan 4, 2013 10:21 AM by Lauren Molenburg

Quake near Paonia believed to be caused by coal

PAONIA, Colo. (AP) - Scientists believe a small earthquake near Paonia was likely related to coal mining.

The 2.8 earthquake was recorded at 12:35 a.m. Thursday. It was centered about four miles east of the Delta County town, which is surrounded by working coal mines, as well as orchards and wineries.

Bruce Presgrave, a geophysicist with the U.S. Geological Survey, told The Daily Sentinel (http://bit.ly/Z2UN7b) that it was probably caused by a coal bump or a rock burst.

A coal bump is when a pillar of coal suddenly falls. A rock burst occurs when settling earth bears down on mine walls and causes a sudden release of stored energy and exploding chunks of coal and rock.

Dave Wolny of Colorado Mesa University said small, coal-related quakes are recorded regularly in the area but this is perhaps a bit larger.

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Information from: The Daily Sentinel, http://www.gjsentinel.com

(Copyright 2013 The Associated Press. All rights reserved.)

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