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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
