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.
A team from the U.S. Environmental Protection Agency is preparing recommendations for "managing or minimizing" earthquakes triggered by natural gas and oil injection wells like the one in Youngtown.
But the group appears to have retreated from its initial goal of finding ways to avoid earthquakes caused by injection wells.'
The EPA has not publicized its earthquakes research, but has shared the results with state officials, researchers and interested groups.
Scientists have known for years that underground injection of fluids can lubricate faults and unleash small earthquakes like the dozen that hit the Youngstown area in the last 12 months.
Plus, more injection wells will be needed as the shale drilling boom expands in Ohio and other states.
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