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(5 12 09) How Earthquakes Work
(5 12 09) How Earthquakes Work
(5 12 09) How Earthquakes Work
(5 12 09) How Earthquakes Work
(5 12 09) How Earthquakes Work
(5 12 09) How Earthquakes Work
(5 12 09) How Earthquakes Work
(5 12 09) How Earthquakes Work
(5 12 09) How Earthquakes Work
(5 12 09) How Earthquakes Work
(5 12 09) How Earthquakes Work
(5 12 09) How Earthquakes Work
(5 12 09) How Earthquakes Work
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(5 12 09) How Earthquakes Work

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  • 1. Jordan Chaires P.4. 5-12-09
  • 2. How Does an Earthquake Work?  An earthquake is a vibration that travels through the earth's crust.
  • 3. Causes of Earthquakes All kinds of things can cause earthquakes: movements of the earth's plates volcanic eruptions meteor impacts underground explosions (an underground nuclear test, for example) collapsing structures (such as a collapsing mine)
  • 4. Steps to an Earthquake Destruction to Plate families, homes, Seismic Waves Movements and contries
  • 5. Facts  An Earthquake occurs about once every 11 seconds.  There have been more than 1.5 million earthquake- related fatalities in the last hundred years.
  • 6. Plate Tectonics  Seismology - the study of earthquakes  The basic theory is that the surface layer of the earth (lithosphere) is comprised of many plates that slide over the athenosphere layer.
  • 7. Collide  At the boundaries between these huge plates of soil and rock, three different things can happen:  divergent plate boundary (Plates can move apart)  convergent plate boundaries (Plates can push together)  transform boundaries (Plates slide against each other)
  • 8. Faults  Faults are formed where these plates meet  Faults are breaks in the earth's crust where the blocks of rock on each side are moving in different directions  Earthquakes are most common along fault lines
  • 9. Seismic Waves  When a sudden break or shift occurs in the earth's crust, the energy radiates out as seismic waves, just as the energy from a disturbance in a body of water radiates out in wave form.  Primary waves – can travel through solid, liquid and gas, and so will pass completely through the body of the earth. Typically arrive at the surface as an abrupt thud.  Secondary waves - don't move straight through the earth. They only travel through solid material, and so are stopped at the liquid layer in the earth's core
  • 10. Seismograph  A seismograph is a machine that registers the different waves.
  • 11. The Richter Scale The Richter Scale is used to rate the amount of energy it released. The wave amplitude increases 100 times between a level 7 earthquake and a level 9 earthquake. The largest earthquake on record registered an 9.5 on the currently used Richter Scale.
  • 12. The Richter Scale
  • 13. Conclusion  Earthquakes are mainly formed by the movements of the earth's plates.  They occur all the time but not all of them result in major destruction or fatalities  Seismographs measure earthquakes

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