FORT WORTH, Texas -- A study released Wednesday says there's a plausible connection between a series of earthquakes in North Texas and natural gas drilling.
The dozen or so minor quakes were reported in a few Dallas suburbs from the fall of 2008 through last spring. The largest was a 3.3-magnitude quake, and no major injuries or damage were reported.
The Southern Methodist University and University of Texas study says 11 more quakes occurred that were too small for anyone to notice.
The first quakes occurred after natural gas drilling began near Dallas-Fort Worth International Airport -- and none have been reported since that well stopped operating last fall.
The study doesn't include information about last summer's series of quakes in Cleburne, about 50 miles southwest of Dallas.