The science behind the blast that shook Mankato this afternoon.

When people swore they felt an earthquake this afternoon, it was with good reason. The quarry blast that sent shock waves and registered 2.8  according to U.S. Geological Survey, was unusually strong. Due to atmospheric conditions, specifically low cloud cover, it created what they call a pressure wave. The shock was picked up with high tech equipment as far away as Rochester, so if you were startled, you had good reason to be. Blasts at the quarry have been suspended pending an investigation. The city is advising that anyone wanting to report damage to a building can call 311 or 1-507-387-8600 to arrange an inspection by a city building official.

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