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15 Cards in this Set
- Front
- Back
Earthquakes
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Vibrations of the earths crust.
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Elastic Rebound Theory
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If fault is locked stress builds up until rock factures and then it springs back to the original position.
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Aftershocks
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Small post-earthquake tremors caused by Elastic Rebound
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Focus
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Area along fault where slippage first occurs.
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Epicenter
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Point directly above the focus
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Pacific Ring of Fire
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The largest earthquake zone. Most plates are subducted while others scrape past each other.
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Fault Zones
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Groups of interconnected faults. They form at plate boundaries because of the intense stress caused when plates separate, collide, subduct, or slide past each other.
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P waves
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Primary Waves. Move fastest and move through solids and liquids. Rock part
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S waves
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Secondary Waves. Slower than P waves and can only travel through solids. Rock particles move at right angles to the direction of the waves.
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L Waves
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P waves and S waves turn into L waves or long waves. They are the slowest moving waves. They tavel like ocean waves.
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microquakes
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Earthquakes with a magnitude less than 2.5 on the richter scale.
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Mercalli scale
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Expresses the intensity of tghe quake. Ex. II "Felt only by a few persons at rest, espcially on upper floors of buildings. Delicatly suspended objects may swing"
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Intensity
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The amount of damage a quake causes.
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Tsunami
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Giant ocean waves caused by an ocean floor earthquake.
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Seismic Gaps
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A place where the fault is locked and unable to move. Scientist think that they are places of future earthquakes.
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