"Study: Quakes Linked To Post-Gas Drilling Process"

"A wastewater disposal process done after natural gas extraction — and not the drilling itself — is a plausible cause for the surprising series of minor earthquakes in north Texas, according to a study released Wednesday.

he first quakes occurred in October 2008 in Grand Prairie and Irving, and seismic equipment detected 11 more in the area over the next couple of months that were too small to be felt, according to the study by the University of Texas and Southern Methodist University. No major injuries or damage were reported in any of the events that set off car alarms and knocked pictures off walls — the largest being a 3.3-magnitude quake near Euless last spring."

Angela K. Brown reports for the Associated Press March 11, 2010.