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Earthquake Waves

Earthquakes and Seismic Waves

TermDefinition
earthquake vibration of Earth produced by rapid release of energy
focus point within the Earth were earthquake starts
epicenter location on surface directly above focus
elastic rebound As tectonic plates are slowly moving, their edges are locked in place, causing bending of the crust along the plate edges.
aftershock movement that follows major earthquakes
foreshock small earthquakes before major earthquakes
intensity measures amount of shaking at a particular location. further from focus = less
magnitude measures size of earthquake at its source. no distance factor.
Mercalli scale measures intensity based on observed effect of earthquake on Earth's humans, surface, manmade structures.
Richter scale measures earthquakes energy from seismic waves using seismograph.
seismograph device senses/records vibrations
seismogram data recorded by seismograph
wave some kind of disturbance that transmits energy
transverse wave wave that moves perpendicular
longitudinal wave waves that move parallel
medium the material waves move through
crest upward displacement
trough downward displacement
amplitude displacement from rest
wavelength consecutive distance between waves
P waves push and pull. #1 fastest speed. travels through solids and liquids. #3 damage rank
S waves shake and shear. #2nd fastest. travels through solids, liquids, and gasses. #2 in damage rank.
surface waves slowest speed. travels through gasses, #1 in damage rank
travel-time graph shows the distance away from the epicenter to the specific seismic station
triangulation determine the earthquake location by using the distance from the Boise using waves.
Created by: darcmmcg
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