An ice quake (also called a frost quake or cryoseism) is a small, cold‑weather seismic event that happens when water in the ground suddenly freezes, expands, and cracks the surrounding soil or rock, often with a loud boom that can feel like a tiny earthquake.

What is an ice quake?

Ice quakes are non‑tectonic seismic events, meaning they are not caused by moving tectonic plates like normal earthquakes but by rapid freezing of water in saturated ground or ice.

They are most common in very cold snaps, especially after rain or melting snow has soaked the ground and temperatures then plunge quickly well below freezing.

In simple terms:

  • Water fills cracks and pores in soil or rock.
  • A sharp temperature drop freezes that water very quickly.
  • Because water expands when it freezes, pressure builds up.
  • The ground suddenly fractures, releasing energy as a boom and small tremor.

How do ice quakes feel and sound?

People often report:

  • A single loud bang or series of pops, like a gunshot, thunder, or an explosion.
  • Brief shaking or a jolt that can rattle windows or walls.
  • No obvious damage or only small ground cracks or heaving in yards, driveways, or fields.

They can be startling at night, because they tend to happen during or right after the coldest part of a deep freeze, when the temperature drop is fastest.

Conditions that create an ice quake

Typical setup for a frost/ice quake on land:

  1. Recent moisture
    • Rain, melting snow, or other liquid water has recently soaked into the ground.
  2. Saturated soil or rock
    • The ground is moist enough that pores and cracks are filled with water.
  1. Little snow cover
    • Thin or no snow on top, so there is no insulating “blanket” to slow freezing.
  1. Rapid temperature plunge
    • Temperatures drop from around freezing to well below, often to around −18 °C (0 °F) or colder, within about 16–48 hours.

When all of this happens, the freezing and expansion of water build up enough stress for the ground to crack and release seismic energy as an ice quake.

Ice quakes in glaciers and polar regions

The term “ice quake” is also used for seismic events inside glaciers or ice sheets:

  • Glacial ice quakes can occur when ice blocks crack, slide, or calve off into the ocean.
  • Some large calving events in Greenland and Antarctica have produced seismic signals comparable to moderate earthquakes (magnitude 5 or more).
  • These are still cryoseisms, but they happen in massive ice rather than in frozen soil.

Places with extreme cold, like Antarctica or parts of the Arctic, can experience icequakes routinely because of the intense, repeated stresses on thick ice and frozen ground.

Are ice quakes dangerous?

Most frost/ice quakes in populated areas are considered minor and generally harmless:

  • They can scare people and pets because of the sudden boom.
  • They may cause small cracks or heaving in driveways, patios, or soil, but serious structural damage is rare.
  • Seismographs can detect them, and they can be mistaken for very small earthquakes until experts check the signal type and weather conditions.

Glacial ice quakes, by contrast, can be part of larger ice‑mass movements and calving events, which matter for glacier stability and sea‑level research.

Why is “what is an ice quake” trending now?

During major cold snaps—like those affecting parts of the United States and the Midwest in early 2026—many people reported mysterious booms at night, especially in places like Tennessee, Kentucky, Michigan, and around Chicago.

As meteorologists and local news outlets explained that these booms were frost quakes, the phrase “what is an ice quake” started trending in searches and news headlines.

Recent coverage has included:

  • Local TV weather explainers in Chicago, breaking down the basics of icequakes during an extreme cold snap.
  • National and international news segments describing “mysterious booms” linked to frost quakes across several US states in January–February 2026.
  • Online explainers from science and weather sites clarifying that these events are real but usually not dangerous.

Quick FAQ

Is an ice quake the same as an earthquake?
No. Earthquakes are caused by tectonic plate movement or volcanic activity, while ice quakes are caused by rapid freezing and expansion of water in the ground or ice.

Can you predict ice quakes?
You can’t forecast the exact moment, but forecasters can flag high‑risk periods: recent rain or melt, thin snow cover, and a rapid plunge to very low temperatures.

What should I do if I hear one?
If you hear a loud boom and feel a quick jolt during an extreme cold spell and see no clear damage, it may be a frost quake; if you suspect damage or anything feels unsafe, treat it like you would a small earthquake and check your property and local alerts.

Bottom note: Information gathered from public forums or data available on the internet and portrayed here.