Only a handful of the thousands of waste disposal wells across the United States have been linked to induced or triggered earthquakes. Still, two well-documented cases—Rocky Mountain Arsenal, Colorado, in the 1960s (Healy et al. 1968) and Paradox Valley, Colorado, in the 1990s (Ake et al. 2005)— demonstrate that fluid injection into the subsurface can trigger earthquakes. The largest event at Rocky Mountain Arsenal was M 5.2, and the largest event at Paradox Valley was M 4.3. The U.S. Environmental Protection Agency provides Underground Injection Control (UIC) regulations administered by the states to protect underground sources...

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