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Earthquakes
Earthquakes
Earthquakes
Earthquakes
Earthquakes
Earthquakes
Earthquakes
Earthquakes
Earthquakes
Earthquakes
Earthquakes
Earthquakes
Earthquakes
Earthquakes
Earthquakes
Earthquakes
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Earthquakes

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Transcript

  • 1. Earthquakes
  • 2. What is an earthquake?
    • The shaking and trembling that results from the movement of rock between the Earth’s surface.
  • 3. Fault
    • A break in Earth’s crust where slabs of crust slip past each other.
  • 4. Where do faults occur?
    • Faults usually occur along plate boundaries, where the forces of plate motion compress, pull, or shear the crust so much that the crust breaks.
  • 5. 3 types of faults
    • Strike slip fault
    • Normal fault
    • Reverse fault
  • 6. Strike-Slip Fault
    • Rocks on either side of the fault slip past each other sideways with little up-or-down motion.
  • 7. Normal Fault
    • The fault is at an angle, so one block of rock lies above the fault while the other block lies below the fault.
  • 8. Reverse Fault
    • Has the same structure as a normal fault, but the blocks move in the opposite direction.
  • 9. Faults in Action
  • 10. Tsunamis
    • A large wave produced by an earthquake on the ocean floor.
  • 11. Measuring Earthquakes
  • 12. Seismic Waves
    • Vibrations that travel through Earth carrying the energy released during an earthquake.
      • Primary Waves
      • Secondary Waves
      • Surface Waves
  • 13. Primary Waves (p waves)
    • The very first waves to arrive.
    • They compress and expand the ground like an accordion.
  • 14. Secondary Waves (s waves)
    • Come after the primary waves.
    • Vibrate from side to side as well as up and down.
  • 15. Surface Waves
    • Form when S and P waves reach the Earth’s surface.
    • Produce the most severe ground movements.
  • 16. Richter Scale
    • Developed by Charles Richter in 1935.
    • Rating of the size of seismic waves as measured by a particular type of seismograph.

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