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.
More December news:
The Youngtstownn Vindicator reported in early December that the Ohio Department of Natural Resources was installing new seismographs to detect earthquakes near a brine injection well in Youngsatown.
The equipment was installed by the Lamont-Doherty Earth Observatory at Columbia University.
The observatory had reported that a small earthquake on Nov. 25 was a few blocks from the D&L Energy Inc. injection well. It was the eighth small quake centered in Mahoning County.
Most of the quakes have been reported about 7,500 feet below the bottom of the D&L well on Youngstown's wst side.
The new equipment _ four seismographs _ will enable scientists to better pinpoint the location of the earthquakes and to determine if the injection well is triggering the quakes.
It is an issue that has been raised in Arkansas, Colorado and other states.
Injection wells are used in Ohio to dispose of brine and drilling wastes by injecting it under pressure into underground rock formations. Ohio has nearly 200 injection wells.