A frost quake (shimo jishin, or 霜地震) is produced when soil or groundwater that has become saturated with water after a period of heavy rainfall freezes and expands after a sharp drop in air temperature. The earth subsequently cracks, creating a loud popping sound that can sometimes feel like a mild earthquake. This phenomenum was most recently observed in parts of Canada.
5 hours ago
With your current subscription plan you can comment on stories. However, before writing your first comment, please create a display name in the Profile section of your subscriber account page.