In 2011 the US Geological Survey (USGS) linked 50 Oklahoma earthquakes to fracking, and a British fracking operation recently fessed up to causing earthquakes in England. An earthquake linked to fracking in Ohio was so strong that its effects were felt in Toronto.
Now a new report from the USGS to be presented next month at the annual meeting of the Seismological Society of America in San Diego directly links an "unprecedented" increase in frequency and magnitude of earthquakes to drilling for oil and gas.
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