7.1 Notes Seismic Waves.

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Presentation transcript:

7.1 Notes Seismic Waves

How do we know there are different layers of the Earth? Because of seismic waves from earthquakes Seismic waves travel through solids faster than liquids Seismic waves change direction when they change the material they are going through (from a solid to a liquid)

elastic rebound – the sudden return of deformed rock to its normal undeformed shape. (i.e. rubber band)

seismic waves – waves of energy that travel through and on the Earth 2 types of seismic body waves: P-waves (primary waves) – the fastest seismic waves that travel through solids, liquids, and gases (the P-waves move like a slinky) S-waves (secondary waves) – the second fastest seismic waves that travel through solids (the S-waves move like a snake)

1 type of seismic surface waves : L-waves (land & last waves) – the slowest and most destructive seismic waves that travel only on the surface/land (the L-waves move in big slow circles)