Pat Shingleton: "Shakin' and Boomin'"
During episodes of hurricanes we may experience the sound of a transformer exploding, loud enough to gain attention. Middle Tennessee residents experienced episodes of loud booms and explosions Wednesday evening. Police and news stations fielded reports from Ashland City, Hermitage, Hohenwald and Nolensville where residents experienced noises that resembled 4th of July cannon fire. Years ago these booms were called "Frost Quakes," and are also referred to as "cryoseismic booms." Typically the freeze-line is 14 inches under the surface, in these areas, however days of record cold has caused mini-explosions. Water running into the ground interacts with the air temperature and rapidly expands. The released pressure causes booms and tremors.
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