Fracking rarely linked to earthquakes, U of A professor says

Hydraulic fracturing has had limited impact on the rising number of earthquakes in Alberta, according to research led by a University of Alberta professor and geophysicist. 
There has been substantial hydraulic fracturing, also known as fracking, in Alberta since the 1950s and the earthquake rate has increased slightly, but Mirko Van der Baan said Monday this is happening in very specific clusters. 
Looking at the numbers, he said between 170,000 and 180,000 hydraulic fracturing treatm