EagleTribune.com, North Andover, MA

World/National News

February 6, 2014

Around the World and Nation

(Continued)

The house is more than 100 years old and creaks, Herron said, but he had “never heard anything like that before.”

As his neighbors in tiny Paris, Mo., huddled around televisions Sunday for the Super Bowl, many were startled by similar strange noises. Some even saw flashes of light and called 911.

Scientists say the community experienced a rare natural phenomenon known as a “frost quake,” which happens when moisture in the ground suddenly freezes and expands. If conditions are just right, the soil or bedrock breaks like a brittle frozen pipe, generating mysterious noises that range from an earthquake-like rumble to sharp cracking sounds sometimes mistaken for falling trees.

This winter has been ripe for frost quakes, known technically as cryoseism. Temperatures have been frigid, but occasional warm-ups have allowed for thawing. And the temperature swings have sometimes been abrupt.

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