Frost Quake Roof

Earthquake canada says it was a frost quake.
Frost quake roof. When this happens the results can be explosive and quite startling. Residents around the gta reported hearing a loud bang in the middle of the night friday jan. Scientifically known as a cryoseism an ice quake or frost quake is a rare but surprising phenomenon that is caused when water seeps into the ground and then quickly freezes and expands cracking the ground around it. The booms that have been heard around the gta could be a result of a frost quake but it could be something else.
He says a similar event can also happen when water collects on flat roofs.
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