Glossary of Modern Earth Science Chapter 6 Terms

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Vibrations of the earths crust.
Elastic Rebound Theory
If fault is locked stress builds up until rock factures and then it springs back to the original position.
Small post-earthquake tremors caused by Elastic Rebound
Area along fault where slippage first occurs.
Point directly above the focus
Pacific Ring of Fire
The largest earthquake zone. Most plates are subducted while others scrape past each other.
Fault Zones
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.
P waves
Primary Waves. Move fastest and move through solids and liquids. Rock part
S waves
Secondary Waves. Slower than P waves and can only travel through solids. Rock particles move at right angles to the direction of the waves.
L Waves
P waves and S waves turn into L waves or long waves. They are the slowest moving waves. They tavel like ocean waves.
Earthquakes with a magnitude less than 2.5 on the richter scale.
Mercalli scale
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"
The amount of damage a quake causes.
Giant ocean waves caused by an ocean floor earthquake.
Seismic Gaps
A place where the fault is locked and unable to move. Scientist think that they are places of future earthquakes.

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