they break, they make this thumping sound, this booming sound," Phillips said. "The ice doesn't have any place to go, and the rocks that have water that has now frozen. The water expands as it becomes ice and when it fills up the empty spaces, it starts pushing on the earth around it. With temperatures plunging to –10 C from 7 C, that water freezes. As it does, it can move rocks and soil, occasionally causing them. ![]() 6 As water drains into the ground, it may eventually freeze and expand under colder temperatures, putting stress on its surroundings. Also called ice quakes or cryoseisms, the cracking or booming sounds occur when moisture below ground starts to freeze and expand. Halifax has had an exceptionally rainy winter, and all that water poured into the earth. A cryoseism, ice quake or frost quake, 1 2 3 4 is a seismic event caused by a sudden cracking action in frozen soil or rock saturated with water or ice, 5 or by stresses generated at frozen lakes. There's no room for those molecules of water to go." But they are weather-driven, not tectonic. "That ground has to be full of water, just brimming with water," he said. Frost quakes (also known as cryoseisms) can generate tremors, thundering sensations and explosive noises. He said conditions have to be just right to set off a frost quake. cryoseism, also called frost quake, ice quake, or icequake, the sudden fracturing of soil or rock caused by rapid freezing of water in saturated ground. ![]() Lots of rain, followed by a rapid freezeĭavid Phillips, a senior climatologist with Environment and Climate Change Canada, said Chiasson has likely found the culprit. "It's loud enough when it occurs that you'll remember it," he said. He did some online detecting and discovered a phenomenon called frost quakes. That cracking causes booming or banging sounds. He started paying attention to the conditions when it happened, and noted it had usually just rained and then gotten very cold. A frost quake describes the cracking of soil and rock that occurs when underground water has suddenly frozen and expanded.
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