Nightly News   |  January 14, 2014

Ice Quakes Shake the Ground in Wisconsin

When water seeps into the cold ground it freezes, expands, and then very noisily cracks.

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This content comes from Closed Captioning that was broadcast along with this program.

>>> dennis olson of fond du lac county , wisconsin thought his garage had blown up, he called the sheriff's department in the middle of the night , they were getting a lot of similar complaints of a ground shaking boom. next day dennis got his stick and found a 100 foot crack in his drive way. geologists believe it was caused by an ice kweik. it happens when water seeps into a very frozen ground. they are most common in polar regions , they've been active, loud and forceful this year in wisconsin.