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EarthquakesEarthquakes
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What is an earthquake?What is an earthquake?
The shaking and trembling that results from the sudden movement of part of the Earth’s crust.
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FaultFault
A break or crack in Earth’s crust along which movement has occurred.
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Focus / EpicenterFocus / Epicenter
Focus: The point beneath the earth’s surface where the rocks break and move.
Epicenter: The point on the earth’s surface directly above the focus
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Seismic WavesSeismic Waves
P-Waves (Primary Waves): These compression waves travel the fastest and can pass through solids, liquids and gases.
P-wave movie
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S-WavesS-Waves
(Secondary Waves) These waves travel slower than P-waves and can travel through solids, but not liquids.
S-wave movie
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L-Waves (Surface Waves)L-Waves (Surface Waves)
The slowest and most damaging wave that moves through the earth like an ocean wave.
L-Wave Movie
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SeismographSeismograph
This is an instrument detects and measures earthquakes.
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TsunamisTsunamisAlso known as Tidal waves, these are ocean
waves created by earthquakes.
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