Friday, 23 February 2018
| Weatherwatch: when cold makes the earth move

Added: 02.02.2018 21:30 | 5 views | 0 comments


A frost quake, or cryoseism, is a rare event in bitter conditions, and several have shaken the earth in the US and in Canada recently
Residents of Ozaukee County, Wisconsin were startled by a loud boom with no visible source last Saturday. Some even reported that windows rattled and their houses shook. What was actually a cryoseism, or .
Cryoseisms have been documented since the early 19th century. They are caused by an explosive release of pressure underground, when water which has drained into cracks in rocks expands as it freezes. Under most circumstances this expansion causes frost weathering, only widening cracks and gradually breaking up exposed rocks. During a cryoseism the pressure is released all at once, when a large section of rock or frozen soil fractures under the strain.

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