FILE - In this Sunday, Nov. 6, 2011 file photo, Chad Devereaux works at cleaning up the bricks that fell from three sides of his in-laws' home in Sparks, Okla., after two earthquakes hit the area in ... more 
FILE - In this Sunday, Nov. 6, 2011 file photo, Chad Devereaux works at cleaning up the bricks that fell from three sides of his in-laws' home in Sparks, Okla., after two earthquakes hit the area in less than 24 hours. Geologists aren’t sure why the area around Arcadia and Luther is seeing an uptick in seismic activity. Some have speculated injection wells from the oil-and-gas industry could be contributing to the problem, while others say it’s a natural phenomenon. (AP Photo/Sue Ogrocki, File) less 
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Associated Press | Photo By AP Photo/Sue Ogrocki
Wed, Apr 16, 2014 5:00 PM EDT