“A spate of earthquakes across the middle of the U.S. is “almost certainly” manmade, and may coincide with wastewater from oil or gas drilling injected into the ground, U.S. government scientists said in a new study.
“Researchers from the U.S. Geological Survey said that for the three decades until 2000, seismic events averaged 21 a year in a central U.S. region. They jumped to 50 in 2009, 87 in 2010 and 134 in 2011.
” ‘Our scientists cite a series of examples for which an uptick in seismic activity is observed in areas where the disposal of wastewater through deep-well injection increased significantly,’ David Hayes, the deputy secretary of the U.S. Department of Interior, said in a blog post yesterday, describing research by scientists at the U.S. Geological Survey.
“In hydraulic fracturing — or fracking — water, sand and chemicals are injected into deep shale formations to break apart underground rock and free natural gas trapped deep underground. Much of that water comes back up to the surface and must then be disposed of.
“The Environmental Protection Agency is preparing to release rules on air pollution from gas wells and on the treatment of wastewater. Other state and federal rules could force more disclosure of the chemicals used by the drilling companies.”
Read More: Bloomberg
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