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  • 1. Earthquakes! Brooke Brown Lyric Estrada Mrs. Smith 3rd Hour April 8, 2011
  • 2. Basic Background Information
    • What is an earthquake?
    • The Shaking that results from the movement of rock beneath earth’s surface.
    • How are earthquakes measured?
    • Seismograph
    • What does magnitude mean?
    • The measurement of an earth quakes strength based based on seismic waves and movement along faults.
    • How is magnitude measured?
    • Mercalli scale, and richter scale.
  • 3. Waves
    • What are earthquake waves called?
    • Seismic waves, P waves, S waves, surface waves.
    • What two types of seismic waves are there?
    • P waves (Primary), S waves (Secondary).
    • What two types of body waves are there?
    • Body and surface waves.
  • 4. Body Waves
    • How do P waves travel?
    • P waves travel through the body of the earth.
    • How do S waves travel?
    • S waves travel only through solids.
    • Which move faster?
    • P waves travel faster than S waves.
  • 5. Elastic Rebound
    • Elastic Rebound, is a theory which attributes faulting to stresses.
    • Elastic rebound occurs in the transform boundary.
  • 6. The Tohoku Earthquake
    • This quake occurred at :
    • March 11. At 2:46.
    • This quake occurred
    • Japan.
    • The magnitude of this quake was
    • 9.0 magnitude.
  • 7. Effects on the People of Japan
    • Thousands of people are confirmed dead, injured or missing.
    • Towns in the country’s northeast coast were literally wiped out.
    • Countless people are seeking shelter.
  • 8. GPS Sensors
    • All the GPS’s will have to be reset.
    • How does elastic rebound explain this movement.
    • As plates on opposite sides of a fault are subjected to force and shift, they accumulate energy and slowly deform until their intial strength is exceeded.
  • 9. Tsunamis
    • What is a tsunami?
    • A giant wave caused by an earthquake on the ocean floor.
    • How do tsunami waves appear at sea?
    • 3 or 4 foot waves.
    • How high can tsunami waves be?
    • Depends on the depth and size.
    • How fast can tsunami waves move?
    • 475 mph in 15,000 feet of water last slide, copy the links.
  • 10. Websites Used