FILE - In this Nov, 6, 2011 file photo, Chad Devereaux examines bricks that fell from three sides of his in-laws home in Sparks, Okla., following two earthquakes that hit the area in less than 24

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FILE - In this Nov, 6, 2011 file photo, Chad Devereaux examines bricks that fell from three sides of his in-laws home in Sparks, Okla., following two earthquakes that hit the area in less than 24 hours. A study published Thursday, July 3, 2014 by the journal Science explains how just four wells forcing massive amounts of drilling wastewater into the ground are probably causing quakes in Oklahoma. The wells seem to have triggered more than 100 small-to-medium earthquakes in the past five years, according to a study. (AP Photo/Sue Ogrocki, File)

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Associated Press
Thu, Jul 3, 2014 8:01 PM EDT