http://thinkprogress.org/climate/2015/01/06/3608591/77-earthquakes-linked-to-fracking/
"The scientists, from the University of Miami, identified 77 earthquakes of varying size in the Poland Township of Ohio, all occurring between March 4 and March 12 and all located near a group of oil and gas wells. The quakes ranged between magnitudes of 1.0 and 3.0, but the local community reportedly only felt one, a magnitude 3.0 on March 10."
