The new study is the second report this year of fracking-linked earthquakes from drilling in the Utica Shale.
Another case of fracking-caused earthquakes has jolted Ohio. A new study connects some 400 micro-earthquakes near the town of Canton, in Harrison County, to hydraulic fracturing wells. The three wells operated from September through October 2013 in the Utica Shale. Ten of the quakes registered between magnitude 1.7 and magnitude 2.2, but the tremors were too deep to cause damage or to be easily felt by people, according to the study, published Tuesday in the journal Seismological Research Letters.