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The results of an investigation by the British Columbia Oil and Gas Commission, released in August 2012, of a potential link between fracking and a series of earthquakes in the Horn River Basin of Canada. The report finds that fracking over an active fault had indeed triggered a series of earthquakes in the Horn River. There are three known instances of fracking causing earthquakes, out of 60,000+ horiztonal/facked shale wells, which statistically is 0.00005. In other words, it's fantastically rare and only happens when fracking is done right on top of an active geologic fault.