While Chesapeake Energy claims that there is no relationship, researchers have observed that the earthquakes in Central Arkansas declined since two injection wells in the area were shutdown.

FORBES: Chesapeake Good For $38 But Faces Big Fracking Headaches

Two operating injection wells, just outside of the moratorium area, are about 8 miles from some of the quakes.

CNN: Arkansas quake swarms rattle nerves, raise questions

John Armbruster of Lamont-Doherty Earth Observatory, Columbia University, who's been studying seismic events and fracking in the Youngstown area for months, said Friday that it's "virtually certain" that an injection of fracking wastewater caused the New Year's Eve tremor.

CNN: Debate over fracking, quakes gets louder