4.0-Magnitude Earthquake Strikes In Northeast Ohio

12/31/2011 16:32 EST | Updated 03/17/2016 11:48 EDT

McDONALD, Ohio -- Officials said Saturday they believe the latest earthquake activity in northeast Ohio is related to the injection of wastewater into the ground near a fault line, creating enough pressure to cause seismic activity.

The brine wastewater comes from drilling operations that use the so-called fracking process to extract gas from underground shale. But Ohio Department of Natural Resources Director Jim Zehringer said during a news teleconference that fracking is not causing the quakes.