It seems that every month or two someone resurrects a very dead issue: fracking causes earthquakes. MDN has covered the issue extensively over time (just do a quick MDN search on the word earthquake). In a nutshell, the only known instance when the process of fracking a shale gas well has caused an earthquake detectable on the surface was in England, and it was a unique situation where the drilling was shallow and near a geologic fault (see this MDN story).
Canadian energy company Questerre Energy Corporation is working to develop Utica Shale acreage in the St. Lawrence Lowlands area of Quebec province. Must be they’re getting push-back from environmentalists and investors because they’ve just issued what they call a “fact sheet” on the topic of fracking and earthquakes. According to Questerre, fracking does cause earthquakes—but they’re teeny tiny and not detectable on the surface.