Stress And Energy Waves

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Stress And Energy Waves

  1. 1. Stress and Energy Waves Movement during an Earthquake
  2. 2. October 17, 1989 at 5:04 p.m
  3. 3. Stress <ul><li>Stress: Energy stored in the Earth’s crust </li></ul><ul><li>Stress can build up at plate boundaries. </li></ul><ul><li>Potential Energy </li></ul>
  4. 4. Folding <ul><li>Too much stress can cause the rocks to bend or Fold . </li></ul><ul><li>This can form Mountains . </li></ul><ul><li>The Appalachian mountains are folded mountains. </li></ul>
  5. 5. The Appalachian Mountains (Tennessee)
  6. 6. Faulting <ul><li>When there is too much stress , the rocks in the crust may break . </li></ul><ul><li>This can cause earthquakes . </li></ul>
  7. 7. Fault Lines
  8. 8. Seismic Waves <ul><li>Waves of energy that move through the Earth during an Earthquake. </li></ul><ul><li>There are three types: </li></ul><ul><ul><li>Primary waves </li></ul></ul><ul><ul><li>Secondary waves </li></ul></ul><ul><ul><li>Love-Rayleigh waves </li></ul></ul>
  9. 9. Primary (P) waves <ul><li>Body waves move through the interior of the Earth. </li></ul><ul><li>They are the fastest seismic wave, therefore will always arrive first . </li></ul><ul><li>Move through solid, liquid and gas. </li></ul><ul><li>They are compression waves, they move particles forward and backward . </li></ul>
  10. 10. S waves <ul><li>Also body waves. </li></ul><ul><li>Travel more slowly and arrive second . </li></ul><ul><li>Can only move through solids . </li></ul><ul><li>Also called shear waves, because they move particles side to side . </li></ul><ul><li>AKA transverse waves. </li></ul>
  11. 11. Love-Rayleigh Waves <ul><li>Surface waves. </li></ul><ul><li>Solid rock only. </li></ul><ul><li>Move in a rolling motion. </li></ul><ul><li>Cause ripples on the surface. </li></ul>
  12. 12. Seismology and Seismic Waves

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