Chesapeake Energy Corp,the Oklahoma-based firm is the No. 1 driller in Ohio.
Rig Count Interactive Map by Baker Hughes, an energy services company.
Shale Sheet Fracking, a Youngstown Vindicator blog.
The Ohio Environmental Council, a statewide eco-group based in Columbus.
Earthjustice, a national eco-group.
People's Oil and Gas Collaborative-Ohio, a grass-roots group in Northeast Ohio.
Concerned Citizens of Medina County, a grass-roots group.
No Frack Ohio, a Columbus-based grass-roots group.
Fracking: Gas Drilling's Environmental Threat by ProPublica, an online journalism site.
Pipeline, blog from Pittsburgh Post-Gazette on Marcellus shale drilling.
Allegheny Front, environmental public radio for Western Pennsylvania.
D&Energy, the company behind the Youngstown area injection well that has been tied to a dozen earthquakes in the last year, says Ohio based its findings on incomplete science.
In a Friday statement, the company said the Ohio Department of Natural Resources came to its conclusions without testing the well.
The firm says the well complied with all state regulations at the time it was idled by the company on Dec. 30.
D&L said there is "no reason to rush and accept bad or incomplete science" since the well is closed.
The company said it intends to continue its own study into the matter.
The 9,000-foot well opened in late 2010 in Youngstown Township and about five miles from Youngstown.
The state cites "coincidental circumstances" in suggesting that the earthquakes were induced by the Youngstown injection well. Factors included an unknown fault line deep below the ground.
The state says it will require well operators in the future to submit more comprehensive geological data and require electronic monitoring of wastewater shipments. It will also ban injection into deep Precambrian basement rock.
At present, Ohio has 176 other injection wells that are taking drilling wastes from Ohio drillers and from drillers in other states, especially Pennsylvania. Fifteen permits for new injection wells are pending but have been halted by the Youngstown investigation.
Pennsylvania has only six injection wells in the state.
Since 1983, when injection wells began operations in Ohio, about 202 million barrels or 10 billion gallons have been injected into Ohio's disposal wells.
Most of the wells are between 5,000 and 13,000 feet deep in sandstone and limestone formations and the liquids being injected are under pressure