Quake caused by oilsands industry: research

The largest recorded earthquake in Alberta's history was not a natural event, but most likely caused by disposal of oilsands wastewater, new research has concluded.

“This event was caused by wastewater disposal,” said Ryan Schultz, a Canadian seismologist who helped conduct the research while at Stanford University in California.

In November, parts of Alberta near the northwestern town of Peace River were rocked by a series of quakes culminating in one that reached a 5.6 magnitude.

Residents reported being knocked to their knees. The earth was pushed upward by more than three centimetres — enough to register on satellites.

Oilpatch techniques, such as deep disposal wells that inject wastewater kilometres underground, can induce earthquakes. One such well located near the earthquake site, used to dispose of water used in oilsands operations, has injected more than one million cubic metres of wastewater down about two kilometres.

After the record-breaking quake, the Alberta Geological Survey, a branch of the province's energy regulator, attributed it to natural causes.

The centre of the quake, then estimated to be six kilometres underground, was thought too deep and too far away from oilpatch activity in time and space to have been generated by industry.

Not so, said Schultz.

A closer and more thorough look at the data brought the centre of the quake up to about four kilometres beneath the surface. That figure is now reflected in the regulator's catalogue of Alberta quakes.

Similarly, a look at previous research on so-called “induced seismicity” revealed long lag times between deep-well water injection and earthquakes.

A previous disposal site in Alberta started quaking three years after pumping began, Schultz said.

A Dutch disposal well didn't start causing earthquakes for decades.

As well, history shows deep water disposal can cause earthquakes up to 20 kilometres away. Alberta's November earthquakes were nowhere near that distant.

“The clusters of earthquakes were right on top of a deep disposal well,” Schultz said.

His paper suggests that the injected water forced itself between the two sides of a fault deep in the earth. That water was enough to reduce the friction holding the two sides together and eventually resulted in a slippage that shook the surface.

Statistical analysis of correlation between the quakes and the underground pumping was conclusive, Schultz said.

“We had a confidence somewhere between 89 and 97 per cent just in the timing,” he said. “There is enough information to start making these kinds of links.”