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"On Christmas Eve, many people in and around Toronto reported hearing a loud "boom," like something had fallen on their house."
http://globalnews.ca/news/1049816/mysterious-christmas-eve-boom-heard-around-gta/
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.

http://globalnews.ca/news/1049816/mysterious-christmas-eve-boom-heard-around-gta/
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.
