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Mystery of ‘Boom’ Noises In Calgary Solved
Cryoseism, to give ice quakes their correct name, occur in periods of prolonged cold when water deep in the ground freezes.
On March 4th nearly 300 Canadians reported hearing a loud boom across North West Calgary. Natural Resources Canada had them fill out reports about what they heard and where they were when they heard it. From the data they produced a location map detailing the spread of the noise.
An amateur seismologist, Jeff Zambory, had captured the action on his basement equipment. His evidence coupled with the location map saw scientists descending on the Captain Nichola Goddard School in Panorama Hills.
A jagged tear several meters long and up to a meter deep was found in the school yard. This is known as a frost, or ice quake. It’s quite a rare phenomenon, and often the sources are not located.
Cryoseism, to give ice quakes their correct name, occur in periods of prolonged cold when water deep in the ground freezes. The expansion of the water as it freezes causes the surrounding bedrock to fracture, and that’s what makes the noise.
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