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Here is one sensational, yet scary image (Original Post) BlueintheSTL Jan 2019 OP
K&R. Please check your spelling. rzemanfl Jan 2019 #1
Thanks. Just a typo on my part. Corrected it. BlueintheSTL Jan 2019 #3
senational 2naSalit Jan 2019 #2
Yikes. I learned a new phrase yesterday: Frost Quakes fleur-de-lisa Jan 2019 #4

fleur-de-lisa

(14,631 posts)
4. Yikes. I learned a new phrase yesterday: Frost Quakes
Thu Jan 31, 2019, 01:01 PM
Jan 2019
https://www.usatoday.com/story/news/nation/2019/01/31/frost-quakes-chicago-polar-vortex/2730412002/

Extreme cold causes bizarre things to happen, and that was certainly the case Wednesday in Chicago when a series of loud booms were reported.

The temperature in Chicago dropped to 23 below zero early Wednesday, one of the coldest readings ever recorded in the city.

What Chicago residents heard were likely "frost quakes," also known by the dull geological term "cryoseisms."

They occur when a rapid drop in temperature leads to a quick freeze, which causes the rock or soil to burst rather than just slowly expand, according to meteorologist Keith Heidorn. The rapid bursting sounds like noisy quake, along with possible shaking.
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