Earthquakes Release Energy
Seismic Waves <ul><li>The vibrations caused by earthquakes </li></ul>
Focus and Epicenter <ul><li>Focus - the of an earthquake is the pint underground where the rocks first begin to move. </li...
Waves and Energy <ul><ul><li>Earthquakes produce three types of waves </li></ul></ul><ul><ul><ul><li>Primary Waves </li></...
Primary Waves <ul><li>These are the fastest seismic waves </li></ul><ul><li>Also called P waves </li></ul><ul><li>Average ...
Secondary waves <ul><li>Also called S- Waves </li></ul><ul><li>Travel at about ½ the speed of P-waves </li></ul><ul><li>St...
Surface Waves <ul><li>Seismic waves that move along Earth’s surface, not through it’s interior </li></ul><ul><li>Make the ...
Seismograph <ul><li>An instrument that constantly records ground movements </li></ul>Read page 116 (B), using seismographs
Locating Earthquakes <ul><li>Scientist must have at least 3 seismic stations </li></ul><ul><ul><li>Scientist find the diff...
 
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4.2

  1. 1. Earthquakes Release Energy
  2. 2. Seismic Waves <ul><li>The vibrations caused by earthquakes </li></ul>
  3. 3. Focus and Epicenter <ul><li>Focus - the of an earthquake is the pint underground where the rocks first begin to move. </li></ul><ul><li>Epicenter - the point of the Earth’s surface directly above the focus. </li></ul><ul><ul><li>Scientists often name an earthquake after the city that is closest to the epicenter </li></ul></ul>
  4. 4. Waves and Energy <ul><ul><li>Earthquakes produce three types of waves </li></ul></ul><ul><ul><ul><li>Primary Waves </li></ul></ul></ul><ul><ul><ul><li>Secondary Waves </li></ul></ul></ul><ul><ul><ul><li>Surface Waves </li></ul></ul></ul>
  5. 5. Primary Waves <ul><li>These are the fastest seismic waves </li></ul><ul><li>Also called P waves </li></ul><ul><li>Average speed 5km/sec (3mi/sec) </li></ul><ul><li>Can pass through solids, liquids and gases </li></ul>
  6. 6. Secondary waves <ul><li>Also called S- Waves </li></ul><ul><li>Travel at about ½ the speed of P-waves </li></ul><ul><li>Start at the same time as P-waves </li></ul><ul><li>Can travel through solids (rocks) NOT through liquids or gases </li></ul>
  7. 7. Surface Waves <ul><li>Seismic waves that move along Earth’s surface, not through it’s interior </li></ul><ul><li>Make the ground roll or shake from side to side </li></ul><ul><li>Cause the largest ground movements and the most damage. </li></ul><ul><li>The slowest type of seismic waves </li></ul>
  8. 8. Seismograph <ul><li>An instrument that constantly records ground movements </li></ul>Read page 116 (B), using seismographs
  9. 9. Locating Earthquakes <ul><li>Scientist must have at least 3 seismic stations </li></ul><ul><ul><li>Scientist find the difference between the arrival times of the P and S waves at each of the three stations </li></ul></ul><ul><ul><li>The time difference is used to determine the distance of the epicenter from each station. The greater the difference in time, the farther away the epicenter is. </li></ul></ul><ul><ul><li>A circle is drawn around each station, with a radius corresponding to the epicenters distance from that station. The point where the 3 circles meet is the epicenter </li></ul></ul>
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