MINNEAPOLIS (WCCO) — Mankato residents were trembling as they posted about what they believed might have been an earthquake Tuesday morning.

According to social media reports, the shaking happened at about 11 a.m.

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Some displayed a sense of humor about the situation:

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The Mankato Free Press reported that the Blue Earth County Sheriff’s Office believed the culprit to be a blast at one of the quarries, specifically Jefferson Quarry between River and Third Avenue in the northwest part of town.

According to reports, it was a scheduled, controlled explosion. The U.S. Geological Survey (USGS) said the blast was so strong, they measured it at an earthquake magnitude of 2.8.

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For what it’s worth, a map released by the United States Geological Survey seems to indicate Minnesota as one of the very least likely states in the nation to be hit by an earthquake.