Link between fracking process and earthquakes
Researchers study link between the process of fracking and earthquakes
What is fracking?
Fracking, or hydraulic fracturing, is a means of natural gas extraction used in deep natural gas well drilling. Once a well is drilled, millions of gallons of water, sand, and chemicals are injected, under high pressure, into a well. The pressure fractures the shale and props open fissures that allow natural gas to flow more freely out of the well. Fracking uses a mixture of hundreds of chemicals and millions of gallons of water per frack. This water then becomes contaminated and must be cleaned and disposed of. (Source)
The Fracking Map
Original page of map here.
Arkansas, April 21, 2011: Two natural gas companies in Arkansas have agreed to shut down two wells as researchers study whether the fracking operations caused recently unexplained earthquakes in the area. According to researchers, preliminary data showed evidence that could link fracking with over 1,000 quakes in the Arkansas area since September 2010. Update: The scientists found that the earthquakes were probably caused not by fracking but by the disposal of waste liquids from the process into other wells. Those wells have since been shut down. In September, Arkansas banned the use of deep wells to store waste water.
England, October 21, 2011: A British seismologist said Friday that two minor earthquakes in northwestern England “appeared to correlate closely” with the use of hydraulic fracturing. The company suspended its fracking operations shortly after the second earthquake.