From NBC News
Charles Q. Choi LiveScience
Sep. 4, 2013 at 3:54 PM ET
USGS
This map shows the intensity of shaking in the area of a magnitude-3.9 earthquake that struck near Youngstown, Ohio, on Dec. 31, 2011. Research has linked this earthquake to the underground injection of wastewater from fracking.
Wastewater from the controversial practice of fracking appears to be linked to all the earthquakes in a town in Ohio that had no known past quakes, research now reveals.
Read the entire story at http://www.nbcnews.com/science/fracking-practices-blame-ohio-earthquakes-8C11073601