Weatherford Democrat

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April 11, 2014

AP: Ohio geologists link seismic activity to fracking

(Continued)

A U.S. government-funded report released in 2012 found that two worldwide instances of shaking can be attributed to actual extraction of oil and gas, as opposed to wastewater disposal in the ground — a magnitude-2.8 quake in Oklahoma and a magnitude-2.3 quake in England. Both were in 2011.

Later, the Canadian government tied quakes in British Columbia's Horn River Basin between 2009 and 2011 to fracking. Those led to stricter regulations, which news reports indicated had little effect on the pace or volume of drilling.

But for the region encompassing Ohio, Pennsylvania and West Virginia, where energy companies have drilled thousands of unconventional gas wells in recent years, it's a first. The Utica Shale lies beneath the better-known Marcellus Shale, which is more easily accessible and is considered one of the world's richest gas reserves.

Glenda Besana-Ostman, a former seismologist with the Ohio Department of Natural Resources, confirmed the finding is the first in the area to suggest a connection between the quakes and fracking. A deep-injection wastewater well in the same region of Ohio was found to be the likely cause of a series of quakes in 2012.

Under Ohio's new permit conditions, all new drilling sites within 3 miles of a known fault or seismic activity of 2.0 magnitude or higher will be conditioned on the installation of sensitive seismic-monitoring equipment. Results will be directly available to regulators, Simmers said, so the state isn't reliant on drilling operators providing the data voluntarily.

If seismic activity of 1.0 magnitude or greater is felt, drilling will be paused for evaluation. If a link is found, the operation will be halted.

"While we can never be 100 percent sure that drilling activities are connected to a seismic event, caution dictates that we take these new steps to protect human health, safety and the environment," said James Zehringer, director of Ohio's natural resources department.

Ohio has also imposed an indefinite drilling moratorium at the site of the March quakes. The state is allowing oil and gas extraction to continue at five existing wells at the site.

Such events linked to fracking are "extremely rare," said Shawn Bennett, a spokesman for the industry group Energy In Depth, who described the new rules as safeguards that will prevent similar future quakes in Ohio.

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