A seismologist says wastewater disposal from fracking may have caused the largest earthquake ever recorded in Alberta.sasacvetkovic33 / E+ / Getty Images Last November the Canadian province of Alberta experienced the largest earthquake in its recorded history.Shortly thereafter a geologist from the University of Calgary claimed that the series of seismic events - which registered a 5.6 on the Richter scale as it rattled homes down to their bones and knocked residents to their knees - told a local publication that the earthquake was "probably natural.
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