The Ohio Department of Natural Resources (ODNR) has confirmed that a series of earthquakes in the state were caused by injecting leftover fracking fluids, "brine," deep into wells.
ODNR stated today:
Geologists believe induced seismic activity is extremely rare, but it can occur with the confluence of a series of specific circumstances. After investigating all available geological formation and well activity data, ODNR regulators and geologists found a number of co-occurring circumstances strongly indicating the Youngstown area earthquakes were induced. Specifically, evidence gathered by state officials suggests fluid from the Northstar 1 disposal well [a deep injection well primarily used for oil and gas fluid waste disposal] intersected an unmapped fault in a near-failure state of stress causing movement along that fault.
Read More:
http://www.commondreams.org/headline/2012/03/09-1