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Earthquakes and Seismic Waves

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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Earthquakes and Seismic Waves

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  1. Earthquakes and Seismic Waves Dan Tingley, Angel Achar, and Nick Franco

  2. 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

  3. 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

  4. 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

  5. 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

  6. S-Waves • Secondary Waves • Cause the rocks to move at a right angle to the movement of the wave • Slower than P-Waves

  7. Surface Waves • Up and down, side to side movement • Travel along Earth’s surface • Cause the most damage in an Earthquake

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