An  earthquake  is the vibration of Earth produced by the rapid release of energy 06/04/09 ESP 101 Week One
<ul><li>Focus and Epicenter </li></ul><ul><li>Focus  is the point within Earth where the earthquake starts.  </li></ul><ul...
06/04/09 ESP 101 Week One
<ul><li>Elastic Rebound Hypothesis </li></ul><ul><li>Most earthquakes are produced by the rapid release of elastic energy ...
06/04/09 ESP 101 Week One
06/04/09 ESP 101 Week One
06/04/09 ESP 101 Week One
<ul><li>Earthquake Waves </li></ul><ul><li>Body Waves </li></ul><ul><li>Identified as P waves or S waves </li></ul><ul><li...
<ul><li>S waves </li></ul><ul><li>Seismic waves that travel along Earth’s outer layer </li></ul><ul><li>Shake particles at...
06/04/09 ESP 101 Week One
<ul><li>Locating an Earthquake </li></ul><ul><li>Earthquake Distance </li></ul><ul><li>The epicenter is located using the ...
06/04/09 ESP 101 Week One <ul><li>Seismic wave behavior </li></ul><ul><ul><li>P waves arrive first, then S waves, then L a...
06/04/09 ESP 101 Week One
06/04/09 ESP 101 Week One
<ul><li>Three seismograph stations are needed to locate the epicenter of an earthquake </li></ul><ul><li>A circle where th...
<ul><li>1.bugnardo.files.wordpress.com/2008/04/08 earthquakes _and_earths_interior.ppt -  </li></ul>06/04/09 ESP 101 Week ...
<ul><li>The End </li></ul>06/04/09 ESP 101 Week One
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Week One Esp101 What Is An Earthquake Clarakwan

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Week One Esp101 What Is An Earthquake Clarakwan

  1. 1. An earthquake is the vibration of Earth produced by the rapid release of energy 06/04/09 ESP 101 Week One
  2. 2. <ul><li>Focus and Epicenter </li></ul><ul><li>Focus is the point within Earth where the earthquake starts. </li></ul><ul><li>Epicenter is the location on the surface directly above the focus </li></ul><ul><li>Faults </li></ul><ul><li>Faults are fractures in Earth where movement has occurred </li></ul>06/04/09 ESP 101 Week One
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  4. 4. <ul><li>Elastic Rebound Hypothesis </li></ul><ul><li>Most earthquakes are produced by the rapid release of elastic energy stored in rock that has been subjected to great forces. </li></ul><ul><li>When the strength of the rock is exceeded, it suddenly breaks, causing the vibrations of an earthquake. </li></ul>06/04/09 ESP 101 Week One
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  8. 8. <ul><li>Earthquake Waves </li></ul><ul><li>Body Waves </li></ul><ul><li>Identified as P waves or S waves </li></ul><ul><li>P waves </li></ul><ul><li>Are push-pull waves that push (compress) and pull (expand) in the direction that the waves travel </li></ul>06/04/09 ESP 101 Week One
  9. 9. <ul><li>S waves </li></ul><ul><li>Seismic waves that travel along Earth’s outer layer </li></ul><ul><li>Shake particles at right angles to the direction that they travel </li></ul><ul><li>Travel only through solids </li></ul><ul><li>Slower velocity than P waves </li></ul><ul><li>A seismogram shows all three types of seismic waves—surface waves, P waves, and S waves. </li></ul>06/04/09 ESP 101 Week One
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  11. 11. <ul><li>Locating an Earthquake </li></ul><ul><li>Earthquake Distance </li></ul><ul><li>The epicenter is located using the difference in the arrival times between P and S wave recordings, which are related to distance. </li></ul><ul><li>Earthquake Direction </li></ul><ul><li>Travel-time graphs from three or more seismographs can be used to find the exact location of an earthquake epicenter. </li></ul><ul><li>Earthquake Zones </li></ul><ul><li>About 95 % of the major earthquakes occur in a few narrow zones. </li></ul>06/04/09 ESP 101 Week One
  12. 12. 06/04/09 ESP 101 Week One <ul><li>Seismic wave behavior </li></ul><ul><ul><li>P waves arrive first, then S waves, then L and R </li></ul></ul><ul><ul><li>Average speeds for all these waves is known </li></ul></ul><ul><ul><li>After an earthquake, the difference in arrival times at a seismograph station can be used to calculate the distance from the seismograph to the epicenter . </li></ul></ul>
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  15. 15. <ul><li>Three seismograph stations are needed to locate the epicenter of an earthquake </li></ul><ul><li>A circle where the radius equals the distance to the epicenter is drawn </li></ul><ul><li>The intersection of the circles locates the epicenter </li></ul>06/04/09 ESP 101 Week One
  16. 16. <ul><li>1.bugnardo.files.wordpress.com/2008/04/08 earthquakes _and_earths_interior.ppt - </li></ul>06/04/09 ESP 101 Week One
  17. 17. <ul><li>The End </li></ul>06/04/09 ESP 101 Week One
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