waves of energy caused by the sudden breaking of rock within the earth. the energy travels through the earth out from the focus
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recorded by?
seismometer
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3 types
P-waves, S-waves and surface waves
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P-waves
primary waves
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travel speed?
fastest
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direction
shake the ground backwards and forwards in the direction of travel
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can travel through?
solids and liquids
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S-waves
secondary waves
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travel speed and direction
slower and move sideways
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direction
shake the earth at right angles to the direction of travel
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can travel through
cannot move through liquids
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damage?
more damage than P-waves
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surface waves
travel along the surface
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speed
slower
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types:
L-waves (love waves) and Raleigh waves
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damage
most destructive
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L- waves speed
slower than S and P
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direction
ground to move sideways
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travel through
solids
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raleigh waves speed
slowest
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direction
cause ground to move up and down
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travel through
liquids and solids
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shadow zones
different seismic waves provide evidence for earth structure. P-waves liquid and solid but S-waves only solid. Concluded outer core is liquid due to shadow zones created by S-waves
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