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fault

A break in the earth's crust

aftershock

An earthquake that occurs after a larger earthquake in the same area

vent

The opening through which molten rock and gas leave a volcano

focus

The point beneath Earth's surface where rock breaks under stress and causes an earthquake

Seismograph

a device that measures the strength of an earthquake

seismic waves

vibrations that travel through Earth carrying the energy released during an earthquake

magnitude

Measure of the energy released during an earthquake

Epicenter

Point on Earth's surface directly above an earthquake's focus