Earthquake

Earthquakes are the Earth's way of releasing built-up stress. Think of it like a giant rubber band: the tectonic plates are constantly moving and stretching until eventually, something "snaps," sending ripples of energy through the ground.

1. Why Do They Happen?

The Earth's outer shell is broken into giant puzzle pieces called tectonic plates. These plates are always moving, but their edges are rough and often get "stuck" while the rest of the plate keeps sliding.

The Build-up: When the plates get stuck, energy builds up like a compressed spring.
The Snap: When the force of the moving plates finally overcomes the friction of the jagged edges, the rocks break or slip.
The Waves: This sudden release of energy creates seismic waves—the actual shaking we feel.

2. Key Terms to Know

Term Definition
Hypocenter (Focus) The exact spot underground where the rock first breaks.
Epicenter The point on the Earth's surface directly above the hypocenter.
Fault The fracture or "crack" in the Earth's crust where the slip happens.
Magnitude The measure of the energy released (often recorded on the Richter or Moment Magnitude scale).
Eksportér til Sheets

3. Types of Earthquakes

Tectonic: The most common; caused by plate movements.
Volcanic: Triggered by the movement of magma under a volcano.
Collapse: Small quakes caused by the collapse of underground caverns or mines.
Explosion: Caused by the detonation of chemical or nuclear devices.

4. Safety: What to Do During Shaking

The gold standard for safety is Drop, Cover, and Hold On:

DROP down onto your hands and knees.
COVER your head and neck under a sturdy table or desk. If no shelter is nearby, get down next to an interior wall.
HOLD ON to your shelter until the shaking stops.

Pro Tip: Stay away from glass, windows, and heavy furniture that could fall. If you are outside, move to an open area away from buildings, power lines, and trees.

Recent Activity (Early 2026)

As of early February 2026, there has been notable seismic activity in several regions: