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Earthquakes Waves

Earth Science Terms About Earthquakes And Seismic Waves

TermDefinition
earthquake a sudden and violent shaking of the ground, sometimes causing great destruction, as a result of movements within the earth's crust or volcanic action.
focus the center of interest or activity.
epicenter the point on the earth's surface vertically above the focus of an earthquake.
elastic rebound The elastic rebound theory is an explanation for how energy is spread during earthquakes
aftershock a smaller earthquake following the main shock of a large earthquake.
foreshock a mild tremor preceding the violent shaking movement of an earthquake.
intensity the measurable amount of a property, such as force, brightness, or a magnetic field.
magnitude the great size or extent of something
mercalli scale a scale formerly used to describe the magnitude of an earthquake
richter scale a numerical scale for expressing the magnitude of an earthquake on the basis of seismograph
seismograph an instrument that measures and records details of earthquakes, such as force and duration.
seismogram a record produced by a seismograph.
wave disturbance that transmits energy
transverse wave wave particles vibrate perpendicular to wave direction
longitudial wave wave particles vibrate parallel to wave direction
medium material that a wave moves through
crest upward displacement of a wave
trough downward displacement of a wave
amplitude height of a wave
wave length distance between consecutive waves
P waves primary body wave (earthquake) ; fastest : least damaging : longitudial wave
S waves
surface waves
travel-time graph use delay to find distance to epicenter
triangulation located at the epicenter
Created by: hannioma