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Earthquakes and Seismic waves chap 6 lesson 2

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by

Dan Grubb

on 8 March 2013

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Transcript of Earthquakes and Seismic waves chap 6 lesson 2

Earthquakes and Seismic Waves Secondary Waves
S Waves Rocks vibrate perpendicular to wave direction
Only travel through solids
Called Shear waves
Slower than P waves Primary Waves
(P Waves) Compression waves that move parallel to the same direction the wave moves. Surface Waves Once P and S waves reach the surface they become
surface waves.
Side to side swaying or rolling motion
Slowest seismic wave
Generally cause the most damage at the Earth's surface The fastest seismic waves
First to be detected on a seismograph
Travel through both solids and liquid Figure 9 P waves arrive first
S waves second
Surface waves last Figure 10 Shadow Zones P waves travel through
Solids and liquid but
change speed and bend








S waves only travel through solids
Remember the outer core of the Earth is
liquid so this stops S waves S Waves S and P waves Animation Mr. Grubb 6th
Grade Alderwood
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