Earthquakes - PowerPoint PPT Presentation

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Earthquakes

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Earthquakes Section 17.2 Earthquakes Shaking of the Earth s crust caused by a release of energy Build-up of stress Stress overcomes friction Plates slip (EQ) Land ... – PowerPoint PPT presentation

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Title: Earthquakes


1
Earthquakes
  • Section 17.2

2
Earthquakes
  • Shaking of the Earths crust caused by a release
    of energy
  • Build-up of stress
  • Stress overcomes friction
  • Plates slip (EQ)
  • Land snaps back into original shape

3
3. Earthquakes
  • Focus point UNDERGROUND where movement starts
  • Epicenter point ON THE SURFACE directly above
    focus

4
3. Earthquakes
  • Seismic Waves
  • Body Waves
  • P-Waves
  • aka Primary Waves
  • Compressional wave movement
  • Travel through solids, liquids, and gasses

5
3. Earthquakes
  • Seismic Waves
  • Body Waves
  • S-Waves
  • aka Secondary Waves
  • Arrive second, slower than p-waves
  • Side-to-side wave movement
  • Travel through solids ONLY

6
3. Earthquakes
  • Seismic Waves
  • Surface Waves
  • L-Waves
  • aka Land Waves or Surface Waves
  • Last waves to occur
  • Cause most damage
  • Rayleigh Waves or Love Waves

7
3. Earthquakes
Body Wave Mantle Outer Core (liquid) Inner Core (solid)
P Speed up, refract Slow down Speed up
S Speed up, refract STOP
8
3. Earthquakes
9
3. Earthquakes
10
Collapse Because Lack of Shear Walls
Loma Prieta, Ca 1986
San Fernando, Ca 1971
San Francisco
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