Grand Junction, Colo. • A federal agency says a minor earthquake in Colorado and Utah might have been caused by a high-pressure well that injects brine 16,000 feet into the earth.
Justyn Hock of the Bureau of Reclamation said Friday the well has caused hundreds of tiny quakes in the past. Officials are looking at whether it caused Wednesday's 3.9-magnitude quake, too.
The well is part of a project that removes excess salt from the Colorado and Dolores rivers. Officials say the project disposes of the salt by injecting into the earth in the form of brine.