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Earthquakes! Brooke Brown Lyric Estrada Mrs. Smith 3rd Hour April 8, 2011

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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 earths 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 countrys northeast coast were literally wiped out.
  • Countless people are seeking shelter.

8. GPS Sensors

  • All the GPSs 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

  • Diigo.com