An earthquake (also known as a quake, tremor or temblor) is the perceptible shaking of the surface of the Earth, resulting from the sudden release of energy in the Earth's crust that creates seismic waves. Earthquakes can be violent enough to toss people around and destroy whole cities. There are around 500,000 earthquakes each year. 100,000 of these can actually be felt. The largest earthquake ever recorded was a magnitude 9.5 (Mw) in Chile on May 22, 1960.
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