Mysterious Christmas Eve ‘boom’ heard and felt around GTA

On Christmas Eve, many people in and around Toronto reported hearing a loud "boom," like something had fallen on their house. FREDERICK FLORIN/AFP/Getty Images

TORONTO – Did you hear it?

Around 11 p.m. Christmas Eve, people reported hearing a loud “boom” in Toronto, Newmarket, Aurora, Belleville, Richmond Hill, and Sutton. Not only was the boom heard, but it rattled houses, leaving many to believe that a tree had fallen on their rooftop.

READ MORE: More mysterious booms heard around GTA

But so far, there hasn’t been an official explanation.

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Even more mysterious is that some people reported hearing booms at other times during the day as well, ranging from 2 p.m. to 6 p.m. to 1 a.m. on Christmas morning.

The United States Geological Service (USGS) didn’t record any seismic event in Ontario yesterday, and there were no reports to the American Meteor Society.

So what was it?

The most likely explanation is that it was a cryoseism, also known as a frost quake.

Cyroseisms are rare, localized seismic events that occur when a sudden drop in temperature freezes the groundwater, which then expands and cracks the soil and rock. The crack will release a sudden burst of explosive energy, resulting in a loud noise and the shaking of the ground. They usually occur between midnight and dawn.

Temperatures  north of the city — in Newmarket, Richmond Hill, and Sutton, for example — were a chilly -20 C or colder on Christmas Eve.

On January 18, 2000, when temperatures were near -20 C in Sadowa, Ontario, 12 frost quakes were recorded in two hours.

Cryoseisms are rare, but they seem to be more common around the Great Lakes.

Two similar events took place in the U.S. in 2011 and 2007.

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According to media reports, in 2011, residents in southwestern Ohio and Indiana reported being awakened by a loud boom as well as the shaking of their homes.

A similar incident occurred in 2007 in Ohio.

What is similar about these events and the Christmas Eve events is that all of them had recently experienced an ice storm.

Is this the answer to the boom of Christmas Eve? We won’t know for sure, but it does seem to be the most likely explanation.

Then again, it could just have been a very noisy Santa.

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