Why do earthquakes happen?

EarthquakeEarthquakes are usually caused when the rock underground suddenly breaks along a fault. This sudden outburst of energy causes the seismic waves that make the ground shake. When two blocks of rock or two plates are rubbing against each other, they stick a little.

During the earthquake and afterward, the plates or blocks of rock start moving, and they continue to move until they get stuck again.

Earthquake-like seismic waves can in addition be caused by explosions underground.

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