Earthquakes in the nation's capitol are as rare as hen's teeth. The epicenter of Tuesday's quake was in Mineral, Virginia, which is located on three very quiet fault lines. The occurrence of yet another freak earthquake in an unusual location is leading many anti-fracking activists (including me -- they have just started fracking in Stratford, which is 40 minutes from New Plymouth) to wonder whether "fracking" in nearby West Virginia may be responsible. Fracking, or hydraulic fracturing, is the process of initiating and subsequently propagating a fracture in a rock layer, employing the pressure of a fluid as the source of energy. The fracturing is done from a wellbore drilled into reservoir rock formations, in order to increase the extraction rates and ultimate recovery of oil and natural gas and coal seam gas.
How Fracking Causes Earthquakes
According to geologists, it isn't the fracking itself that is linked to earthquakes, but the re-injection of waste salt water (as much as 3 million gallons per well) deep into rock beds.
Braxton County West Virginia (160 miles from Mineral) has experienced a rash of freak earthquakes (eight in 2010) since fracking operations started there several years ago. According to geologists fracking also caused an outbreak of thousands of minor earthquakes in Arkansas (as many as two dozen in a single day). It's also linked to freak earthquakes in Texas, western New York, Oklahoma and Blackpool, England (which had never recorded an earthquake before).
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