Source: Daily Kos.
I’ve long been aware that hydraulic fracturing for natural gas is associated with earthquakes, but I had thought the main reason was the settling of the geological strata after the fracking process is complete and the fracking fluid is pumped out.
But according to a report by the U.S. Geological Survey, the main cause of fracking-induced earthquakes is the injection of the huge amounts of contaminated waste water into deep geological strata.
Large areas of the United States that used to experience few or no earthquakes have, in recent years, experienced a remarkable increase in earthquake activity that has caused considerable public concern as well as damage to structures. This rise in seismic activity, especially in the central United States, is not the result of natural processes.
Instead, the increased seismicity is due to fluid injection associated with new technologies that enable the extraction of oil and gas from previously unproductive reservoirs. These modern extraction techniques result in large quantities of wastewater produced along with the oil and gas. The disposal of this wastewater by deep injection occasionally results in earthquakes that are large enough to be felt, and sometimes damaging. Deep injection of wastewater is the primary cause of the dramatic rise in detected earthquakes and the corresponding increase in seismic hazard in the central U.S.
via USGS Release.
Meanwhile in California the Center for Biological Diversity, a non-profit conservation organization, has found deep underground storage of oil fracking waste water has allowed toxic and cancer-causing chemicals to contaminate aquifers, underground reservoirs that can be a source of irrigation and drinking water.