New Evidence Links Earthquakes to Fracking

From:  EcoWatch 

by Anastasia Pantsios

The evidence linking fracking to earthquakes continues to pile up.

A study by seven researchers from California, Colorado, Massachusetts, New Mexico, North Carolina, Ohio and the UK, The Environmental Costs and Benefits of Fracking, said “Unconventional oil and natural gas extraction enabled by horizontal drilling and hydraulic fracturing [fracking] is driving an economic boom with consequences described from ‘revolutionary’ to ‘disastrous.’ The reality lies somewhere in between.”

This map shows the intensity of shaking in the area of a magnitude-3.9 earthquake that struck near Youngstown, Ohio, on Dec. 31, 2011. Research has linked this earthquake to the underground injection of wastewater from fracking.
Map credit: U.S. Geological Survey

The studies findings were many, including that fracking “generates income and, done well, can reduce air pollution and even water use compared with other fossil fuels.” But it also found it can reduce investment in renewables and when done carelessly, can release toxic chemicals into the environment. It also agreed: fracking causes earthquakes.

In a section headed “Induced Seismicity,” the study said, “The reactivation of faults from hydraulic fracturing, wastewater disposal and other processes such as CO2 sequestration occurs by increasing the pore pressure and therefore reducing the effective stress within a fault zone. The increased pressure allows elastic energy stored in rock to be released more easily, much like removing weight from a box to make it easier to slide along the floor. Injecting fracturing fluids or wastewater underground can intersect a fault zone directly or transmit a pulse in fluid pressure that reduces the effective stress on a fault.”  MORE