Have you heard loud booms over the past few days?
You may have witnessed a weather phenomenon known as a frost quake.
Frost quakes, sometimes called ice quakes or cryoseism, happen when areas see record-breaking freezing temperatures that set on quickly. Any water or liquid in soil or rock will freeze and expand with subzero temperatures, according to the National Weather Service.
The stress on the ground makes it shift momentarily or crack, creating loud booms that can sound like explosions.
Don’t worry, they’re not dangerous, meteorologists say. They’ve been occurring across the Midwest this week.