From Bloomberg News:
By Nidaa Bakhsh - Apr 9, 2013 7:01 PM ET
Hydraulic fracturing used to access oil and gas from rock and shale hasn’t caused “significant”earthquakes, according to a Durham University study.
“Hydraulic fracturing is not a significant mechanism for inducing felt earthquakes,” Richard Davies, director of the U.K. university’s energy institute, said today in a statement.“The size and number of felt earthquakes caused by fracking is low compared to other manmade triggers such as mining, geothermal activity or reservoir water storage.”
Cuadrilla Resources Ltd. drilling caused two tremors in 2011 in northwest England, leading to an 18-month moratorium on the method known as fracking, which uses water, chemicals and sand to blast underground rock and release trapped fuel.
The Durham study found fracking has the potential to reactivate dormant faults, according to today’s statement.
“We cannot see every fault underground and therefore cannot completely discount the possibility of the process causing a small felt earthquake,” Davies said. “But there are ways to further mitigate against the possibility; the oil and gas industry can avoid faults that are critically stressed and already near breaking point.”
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.