Magnitude 3.9 earthquake is linked to brine pumping
Salty water from river discharged into wells, may lubricate faults
The U.S. Bureau of Reclamation facility removes salt from the Dolores River, then pumps 230 gallons of brine per minute into deep wells in Utah's Paradox Valley Area.
The process is intended to decrease the salt content of the Colorado River downstream, but scientists say it also lubricates faults.
The facility has caused thousands of earthquakes in the area since 1991, but most have been too small for people to feel. The 3.9 quake, which struck Nov. 6, was felt in Grand Junction, some 60 miles away. No damage was reported.
"We have a seismic network set up for measuring and recording any events associated with the injection process, and it appears this earthquake was one probably associated with that process," said Andy Nichols, manager of the federal facility. "Every once in a while there's a large event felt at the surface, and this was one of those events."
The last large earthquake occurred in May 2000 and registered 4.3.
That event, combined with two significant tremors in 1999, led government officials to reduce the amount of brine injected by a third.
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