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On the eve of the opening of this year’s Greatest Outdoor Show on Earth, Calgary experienced a case of the wobbles on Thursday that didn’t originate in a Stampede beer tent.

Residents across Calgary reacted with alarm as an overnight earthquake shook the city — prompting local night owls and light sleepers alike to report the tremors on social media.

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Among them were local actress and filmmaker Carolyn Bridget Kennedy, who was on the second floor of her southeast Calgary home when the shaking started a little after 12:30 a.m.

“I heard a low rumbling noise that seemed to surge in small waves — getting louder then quieter, faster and then slowing — alternating for about 20 seconds,” she said.

“I didn’t know what it was. I thought maybe it was an explosion nearby — I didn’t think earthquake at first.”