Earthquakes and Seismic Waves

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# Earthquakes and Seismic Waves - PowerPoint PPT Presentation

Earthquakes and Seismic Waves. Dan Tingley, Angel Achar, and Nick Franco . Fault. Fault - break in the rocks that make up the Earth’s crust To be a fault, the rocks on either side must be moving Sometimes the movement is sudden, and it causes an earthquake. Focus and Epicenter.

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Presentation Transcript

### Earthquakes and Seismic Waves

Dan Tingley, Angel Achar, and Nick Franco

Fault
• Fault - break in the rocks that make up the Earth’s crust
• To be a fault, the rocks on either side must be moving
• Sometimes the movement is sudden, and it causes an earthquake
Focus and Epicenter
• Focus - the place in the Earth where the movement happens in an earthquake
• Epicenter - the point on the Earth’s surface directly above the focus
Seismic Waves
• Seismic waves are waves that travel through the Earth because of an earthquake
• Two Kinds: Body and Surface waves

-Body travel inside the Earth

P-Waves
• Primary Waves
• P-waves travel through all the layers of the Earth
• The fastest of all seismic waves
• Squeeze and pull rocks in same direction as the movement of the wave
S-Waves
• Secondary Waves
• Cause the rocks to move at a right angle to the movement of the wave
• Slower than P-Waves
Surface Waves
• Up and down, side to side movement
• Travel along Earth’s surface
• Cause the most damage in an Earthquake