A peer-reviewed study published last week in the Bulletin of the Seismological Society of America linked hydraulic fracturing at two drilling sites in Ohio to nearby earthquakes, the Pittsburgh Post-Gazette reported. Another study published in October in the journal Seismological Research Letters linked other earthquakes in Ohio to fracking. And a March 2014 study linked a magnitude 5.0 earthquake in Oklahoma in 2011 to a wastewater injection well. Meanwhile, state officials in Kansas have been reluctant to link fracking activity to the dramatic increase in earthquakes in Kansas – which went from none in 2012 to 124 earthquakes between Jan. 1, 2014, and Dec. 24, 2014. Part of their hesitation has been the lack of good data, which should be aided by the installation this month of several new seismic monitoring stations. – Phillip Brownlee
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