EDMONTON — The largest recorded earthquake in Alberta’s history was not a natural event, but most likely caused by disposal of oilsands wastewater, new…
After the record-breaking quake occurred, 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.A closer and more thorough look at the data brought the centre of the quake up to about four kilometres beneath the surface.
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.Article content Statistical analysis of correlation between the quakes and the underground pumping was conclusive, Schultz said.Article content
Schultz said the findings could have big implications for Canada’s and Alberta’s climate change plans.
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