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| Original Credit: GreadBeyond on Flickr |
Geologists and politicians have been arguing for several years about whether hydraulic fracturing of shale to release natural gas can cause earthquakes. Finally, a comprehensive study released today by the National Research Council has settled the question: yes, fracking can. The number of earthquakes linked to fracking operations is very small, however; many more temblors are linked to conventional oil and natural gas extraction.
Furthermore, the greatest risk of earthquakes due to fracking does not come from drilling into deep shale or cracking it with pressurized water and chemicals. Rather, it comes from pumping the wastewater from those operations back down into deep sandstone or other formations for permanent disposal, instead of storing it in tanks or open ponds at the surface. In January, wastewater injection was blamed for earthquakes that had just occurred in Youngstown, Ohio, on Christmas Eve and again on New Year's Eve, measuring 2.7 and 4.0 on the Richter scale, respectively. Wastewater injection is also commonly used during conventional oil and gas production.
The epicenter of last year's earthquake my family felt in New York was a mining operation in Virginia.
Things that make you go...hmm.
Scientific American:
Fracking Can Cause Earthquakes, but So Can Oil and Gas Extraction
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