Report: Big Okla. quake in 2011 likely man-made

Associated Press
Report: Big Okla. quake in 2011 likely man-made

FILE - Chad Devereaux examines bricks that fell from three sides of his in-laws home in Sparks, Okla. on Sunday, Nov. 6, 2011 after two earthquakes hit the area in less than 24 hours. A team of scientists have determined that a 5.6 magnitude quake in Oklahoma in 2011 was caused when oil drilling waste was injected deep underground. The report was released Tuesday, March 26, 2013 by the journal Geology. That makes it the most powerful quake to be blamed on deep injections of wastewater, although not everyone agrees. Oklahoma’s state seismologists say the quake was natural. (AP Photo/Sue Ogrocki, File)

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