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  • 1. Seismic Waves Aaron Kafkakis Ryan Harris Mrs. Smith Hour: 4 April 8, 2011
  • 2. Basic Background Information
    • What is an earthquake?
    • An Earthquake is what happens when two blocks of Earth suddenly slip or crack past eachother.
    • How are earthquakes measured?
    • Earthquakes are measured in Seismic Waves measured by Seismographs.
    • What does magnitude mean?
    • The size of an Earthquake is called its Magnitude
    • How is magnitude measured?
    • Magnitude is measured by the size of their Seismic Waves.
  • 3. Damage Caused by Earthquakes
    • Buildings suddenly collapse
    • Tsunamis begin to occur
    • Buildings shake and shutter
  • 4. Waves
    • What are earthquake waves called?
    • Seismic Waves
    • What two types of seismic waves are there?
    • Primary and Secondary Waves
    • What two types of body waves are there?
    • Love and Rayleigh Waves
  • 5. Body Waves
    • How do P waves travel?
    • They push and they pull
    • How do S waves travel?
    • They travel side to side, and up and down.
    • Which move faster?
    • P-waves move faster.
  • 6. Elastic Rebound
    • A mechanism used by Geolgists to explain Earthquakes and suface ruptures.
    • The Elastic Rebound occurs in Divergent Boundaries
  • 7. The Tohoku Earthquake
    • This quake occurred at :
    • 5:30 PM
    • This quake occurred
    • In Honshu, Japan.
    • The magnitude of this quake was
    • 9.0
  • 8. Effects on the environment/earth
    • Nuclear Wastes from Power Plants escape into the evironment
    • Many cities and Humans are heavily damaged
    • Large cracks and sinkholes .
  • 9. Effects on the People of Japan
    • People do not have power from destroyed power plants.
    • Tsunamis flood cities in Japan.
    • Houses and buildings are toppled over.
  • 10. Effects on the Economy of Japan
    • Many offices shut down and people lost jobs.
    • Food and water become scarce and polluted.
    • Fires burn down buildings and kill hundreds.
  • 11. GPS Sensors
    • One interesting fact about this earthquake is that it moved several GPS sensors. This will require all of the GPS sensors to be rearranged.
    • How does elastic rebound explain this movement?
    • Because the boundaries at the Elastic Rebound point shifted, moving Japan.
  • 12. Tsunamis
    • What is a tsunami?
    • A giant wave usually caused by an earthquake.
    • How do tsunami waves appear at sea?
    • After an earthquake hits, the waves cause the water to rise up and move.
    • How high can tsunami waves be?
    • About 50 to 250 feet high.
    • How fast can tsunami waves move?
    • One hundred MPH in deep ocean water.
  • 13. Websites Used