FILE - In this June 26, 2014 file photo, Austin Holland, research seismologist at the Oklahoma Geological Survey, hangs up a chart depicting earthquake activity at their offices at the University of Oklahoma in Norman, Okla. States where hydraulic fracturing is taking place have seen a surge in seismic activity, raising suspicions that the unconventional drilling method, especially the wells in which the industry disposes of its wastewater, could be to blame. (AP Photo/Sue Ogrocki, File)
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