Barnett - Earthquakes
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| focus | point within Earth where the earthquake starts
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| epicenter | location on the surface directly above the focus
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| fault | fractures in the Earth where movement has occurred
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| aftershock | movement that follows a major earthquake
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| seismograph | instrument that records earthquake waves
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| surface waves | seismic waves that travel along Earth's outer layer
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| body waves | waves that travel through Earth's interior; include primary and secondary waves
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| primary wave | fastest body wave; compressional
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| secondary wave | slower than a primary wave; move particles perpendicular to the direction of wave
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| moment magnitude | measurement for earthquakes used by scientists; estimates the energy released by earthquakes
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| Richter Scale | magnitude scale based on the amplitude of the largest seismic wave; used in most news reports
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| tsunami | Japanese word for seismic sea wave
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| intensity | measure of damage to the surface and effects on humans
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| three | number of seismic stations required to locate an epicenter
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| foreshocks | small earthquakes that preceed a major earthquake
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