Report: Big Oklahoma quake in 2011 was likely man-made - Winston-Salem Journal: News

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Report: Big Oklahoma quake in 2011 was likely man-made

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Posted: Tuesday, March 26, 2013 9:13 pm

WASHINGTON — An unusual and widely felt 5.6-magnitude quake in Oklahoma in 2011 was probably caused when oil drilling waste was pushed deep underground, a team of university and federal scientists concluded.

That would make it the most powerful quake to be blamed on deep injections of wastewater, according to a study published Tuesday by the journal Geology. The waste was from traditional drilling, not from the hydraulic fracturing technique, or fracking.

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