Earthquakes in Arkansas May Be Man-Made, Experts Warn

The sudden swarm of earthquakes in Arkansas -- including the largest quake to hit the state in 35 years -- is very possibly an after effect of natural-gas drilling, experts warn.

At issue is a practice called hydraulic fracturing, or "fracking," in which water is injected into the ground at high pressure to fracture rock and release natural gas trapped within it.

Geologists don't believe the fracking itself is a problem. But Steve Horton, an earthquake specialist at the University of Memphis and hydrologic technician with the U.S. Geological Survey, is worried by a correlation between the Arkansas earthquake swarm and a side effect of the drilling: the disposal of wastewater in injection wells.

"Ninety percent of these earthquakes that have happened since 2009 have been within 6 kilometers of these salt water disposal wells," he told FoxNews.com. The timing is too coincidental to ignore, Horton said.

Salt water is a common by-product of the fracking process, and the simplest solution is to inject the toxic wastewater back into the ground. But that can lubricate the surrounding rock, experts warn, possibly leading to quakes


Fox News

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