Does Fracking Cause Earthquakes? Formula Calcs Quake Size

Does fracking cause earthquakes? MDN has covered various stories in the past on this topic. It seems likely that injection wells (not hydraulic fracturing, but the wastewater from fracking being injected deeply in disposal wells) in some locations have been tied to earthquakes in some areas. Notably, when injection wells in Arkansas stopped pumping pressurized liquids into the wells, earthquakes in the area all but stopped (see this MDN story). It certainly seems there is a cause and effect situation.

But what about fracking a single well? Is there a danger that fracking can cause earthquakes? Arthur McGarr, a geologist at the US Geological Survey in Menlo Park, California has worked out a formula for predicting how large an earthquake can result from pumping/injecting fluids underground, including fracking fluids. He recently presented his formula at the annual meeting of the American Geophysical Union in San Francisco, CA. McGarr subsequently spoke to the journal Nature about his formula:

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