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A magnitude 3.9 earthquake struck only six kilometres north-northwest of Banff at 6:33 p.m. Saturday, according to Earthquakes Canada.
The temblor struck at an estimated depth of 17.3 kilometres, directly underneath Cascade Mountain, according to the United States Geological Survey.
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Initial reports of the earthquake from the U.S. agency classified it as a 4.3-magnitude temblor, before being downgraded by Canadian officials. Only 90 minutes after it shook the Rocky Mountain ground, nearly 350 people had reported to the U.S. agency they felt the earth shake.