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Earthquake Vibrations in the earth caused by the sudden releases of energy
Crust The earth's outer layer; the coolest and least dense layer of the earth
Fault A fracture in bedrock, along which blocks of rocks on opposite sides of the fracture move
Mantle The layer of the earth beneath the crust
Lithosphere The cool, solid outer shell of the earth
Lithospheric Plates Large peices of the lithosphere that are always moving
Seismologist A scientist who studies eartgquakes
P-Wave Compress and expand the ground like an accordion
S-Wave Vibrate from side to side
Surface Wave Move more slowly than P Waves and S Waves
Seismic Wave Carry the energy of an earthquake away from the focus, through the Earth's interrior, across the surface
Focus The point at which a rock under stress breaks and triggers an earthquake
Epicenter The point on the surface directly above the focus
Seismograph Is an instrument that records and measures seismic waves
Magnitude Is a number geologist assign to an earthquake based on the earthquake's strength
Ritcher Scale Is a rating of an earthquake's magnitude based on size of earthquake's seismic waves
Mercalli Scale Rate an earthquakes according to the level of damage at a given place
Moment-Magnitude Scale A rating system that estimates the total energy realeased by an earthquake
Liquifaction Occurs when an earthquake's violent shaking suddenly turns loose, soft soil into liquid mud
Aftershock An earthquake that occurs after a large earthquake in the same area
Tsunami The water displaced by a strong earthquake on the ocean floor forms a large wave
Created by: jjperry