From the Fuel Fix newsblog on Aug. 27:
Earthquakes in the Eagle Ford shale region of Texas are likely being triggered by increased oil extraction, according to new research from the University of Texas at Austin.
A two-year survey of seismic activity links small quakes in South Texas largely to the upswing in the production of oil and brackish water that flows up alongside hydrocarbons.
However, researchers concluded the quakes were not related to hydraulic fracturing. Nor do disposal wells, where companies discard hydraulic fracturing fluids and brackish water found underground, appear to trigger the quakes.
Previous studies have linked earthquakes to the disposal of fracking fluids in deep wells in other regions, including in other parts of Texas and in Ohio.
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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.