Fracking likely linked to 4.4 magnitude quake in Fox Creek

Alberta's provincial energy regulator says a significant earthquake in northern Albertawas likely caused by hydraulic fracturing.

If fracturing is confirmed as the cause, scientists say, it will have been the largest earthquake ever toresult fromusing the method.

Residents in the town of Fox Creek noticed the earthquake a week ago on Jan. 22. It was of 4.4 magnitude,severe enough to cause minor damage.

"It felt like a big gust of wind hit the house. The door flew open and the couchmoved," said Kelli Mcphee, who was at home watching a scary movie in her living room at the time.

My husband grabbed a bat and started walking around the house because we didn't know what it was.

Fox Creek, a town of about 2,000 people, is largely sustained by oil and gas development.

That work often useshydraulic fracturing, or fracking, a process that injects a high-pressure mixture of water and chemicals into the earth to break through rock.

In an emailed statement to CBC, the AlbertaEnergy Regulator saidits monitoring system picked up strong evidence thatfracking caused this recent earthquake and likely triggered others too, although it is "impossible to definitively state that it was not a naturally occurring event."

The link betweenfracking and earthquakes is a phenomenon that several scientists are now studying.

We have been seeing earthquakes for about the last year in that area, starting with events just above magnitude 3, said David Eaton, a professor of geophysics at the University of Calgary.

In most cases, those earthquakes have occurred in association with industry activity such as hydraulic fracturing.

Eaton andGail Atkinson, a seismologistat Western University, said if the quake is proved to be caused by hydraulicfracking, it would be the largest one in the world caused by the method.

British Columbia has a policy that requires operations to halt if they trigger an earthquake greater than a 4.0 magnitude.

Alberta does not have a similar rule.