Did you think you felt an earthquake or heard a loud sonic boom today? You are not alone. The scientific term for frost quakes is cryoseism.
Frost quakes are actually known for causing seismic activity so you may have actually felt a small earthquake.
Frost quakes happen when water underground freezes and expands in very cold weather. It can happen in frozen soil and rock as the water seeps deeper underground and expands causing those booms or cracks.
Frost quakes are harmless but they sure are startling