A second earthquake struck Greeley in northeastern Colorado on Monday, June 23 prompting the state's Oil and Gas Conservation Commission to order a halt to the injection of contaminated drilling wastewater into a deep disposal well in the area.
The ban on injecting wastewater will last for 20 days as officials explore a potential link between the injection activity and the sudden jump in seismicity in the area. The most recent quake was a 2.6 magnitude temblor that hit about five miles north of Greeley at 12:27 p.m. It follows a 3.4 magnitude quake which struck the same area May 30.
Two quakes in less than a month, in an area the U.S. Geological Survey formerly called “aseismic,” has led to speculation that the temblors are “frackquakes,” seismic activity induced by the injection of drilling wastewater into deep rock formations.
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