Geologists link Okla.'s largest quake to injection wells
A 2011 earthquake that rattled Oklahoma and destroyed 14 homes was not only unusual -- it was probably unnatural, scientists say. Research published yesterday in the journal Geology links the quake -- the state's largest at magnitude 5.7 -- to underground injection of wastewater from nearby oil and gas production. It is the largest quake ever linked to injection.
States deciding not to look at seismic risks of drilling
Nine months after a National Academy of Sciences panel said oil and gas regulators should take steps to prevent man-made earthquakes, officials in key states are ignoring quake potential as they rewrite their drilling rules.
Brine injection, other causes looked at in Ark. quakes
A new spate of barely felt earthquakes has geologists looking at whether oil and gas wastewater injection wells are causing temblors in north-central Arkansas once again. The wells are just outside the zone where state officials banned injection in 2011 in response to a swarm of much stronger earthquakes. Activity at the two wells rose after the nearby wells closed.