Findingan Epicenter

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Findingan Epicenter

  1. 1. Finding an Epicenter -DeMarco
  2. 2. What is an Epicenter? <ul><li>A point on the surface of the Earth directly above the FOCUS of the earthquake. </li></ul><ul><li>The point within the Earth from which earthquake waves originate. </li></ul>
  3. 3. How can I find out where an earthquake happened? <ul><li>You will need data from 3(three) recording stations. </li></ul><ul><li>You will need your ESRT </li></ul><ul><li>You will need scrap paper </li></ul><ul><li>You will need a map of the area </li></ul><ul><li>You will need a map scale </li></ul><ul><li>You will need a drawing compass </li></ul>
  4. 4. Use the data from the recording stations: <ul><li>Station A: San Francisco, California </li></ul><ul><ul><li>P-Wave arrival 11:26:10 S-Wave arrival 11:28:50 </li></ul></ul>What is the time difference between P and S wave arrivals? 2:40
  5. 5. Recording Board Difference in arrival times: San Francisco: 2:40
  6. 6. Use the data from the recording stations: <ul><li>Station B: Denver, Colorado </li></ul><ul><ul><li>P-Wave arrival 11:28:50 S-Wave arrival 11:33:50 </li></ul></ul>What is the time difference between P and S wave arrivals? 5:00
  7. 7. Recording Board Difference in arrival times: San Francisco: 2:40 Denver, Colorado: 5:00
  8. 8. Use the data from the recording stations: <ul><li>Station C: Seattle, Washington </li></ul><ul><ul><li>P-Wave arrival 11:26:20 S-Wave arrival 11:31:50 </li></ul></ul>What is the time difference between P and S wave arrivals? 5:30
  9. 9. Recording Board Difference in arrival times: San Francisco: 2:40 Denver, Colorado: 5:00 Seattle, Washington: 5:30
  10. 10. Recording Board Difference in arrival times: San Francisco: 2:40 Denver, Colorado: 5:00 Seattle, Washington 5:30 Using your ESRT, find out how far away (in Km) each of the locations must be from the epicenter. (Use the scrap paper tick mark method!) =1,600km =4,000km =3,400km
  11. 11. Recording Board Difference in arrival times: San Francisco: 2:40 =1,600km 1,000 2,000 3,000 4,000 5,000 Open your compass to the EXACT distance on the scale.
  12. 12. Use your carefully set compass to draw a circle around each city.
  13. 13. All three circles should intersect at one point You've found the epicenter!

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