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.
In a time of both misinformation and too much information, quality journalism is more crucial than ever.
By subscribing, you can help us get the story right.