“Frost quakes” reported in southern Wisconsin

MADISON (WKOW) — Quickly falling temperatures Thursday night led to a phenomenon commonly called “frost quakes.” The loud booms and cracks associated with the seismic event happen when ice or frost in the soil or rock freezes quickly. The geological term is cryoseisms.

Social media users in and around Madison reported hearing the booms Thursday evening as the air temperature dropped more than 20 degrees in four hours.

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