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Finding an Epicenter

Finding an Epicenter. -DeMarco. What is an Epicenter?. A point on the surface of the Earth directly above the FOCUS of the earthquake. The point within the Earth from which earthquake waves originate. Seismograph Print-outs. Use the data from the recording stations:.

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Finding an Epicenter

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  1. Finding an Epicenter -DeMarco

  2. What is an Epicenter? • A point on the surface of the Earth directly above the FOCUS of the earthquake. • The point within the Earth from which earthquake waves originate.

  3. Seismograph Print-outs

  4. Use the data from the recording stations: • Station A: San Francisco, California P-Wave arrival 3:02:20 S-Wave arrival 3:06:30 What is the time difference between P and S wave arrivals? 4:10

  5. Use the data from the recording stations: • Station B: Denver, Colorado P-Wave arrival 3:01:40 S-Wave arrival 3:05:00 What is the time difference between P and S wave arrivals? 3:20

  6. Use the data from the recording stations: • Station C: Missoula, Montana P-Wave arrival 3:01:00 S-Wave arrival 3:03:00 What is the time difference between P and S wave arrivals? 2:00

  7. Difference in arrival times: San Francisco: 4:10 Denver, Colorado: 3:20 Missoula, Montana: 2:00

  8. TAKE A PIECE OF PAPER, AND MARK OFF THE DIFFERENCE IN ARRIVAL TIME

  9. MOVE THE PAPER UNTIL THE TWO TICK MARKS LINE UP WITH THE P AND S CURVES WHEN TICK MARKS LINE UP, GO STRAIGHT DOWN AND READ THE EPICENTER DISTANCE EPICENTER DISTANCE OF 2800 KM

  10. EPICENTER DISTANCES San Francisco: 4:10 2,800km Denver, Colorado: 3:20 2,000km Missoula, Montana 2:00 1,100km

  11. Recording BoardDifference in arrival times: San Francisco: 4:10 =2,800km Open your compass to the EXACT distance on the scale. 3,000 4,000 5,000 2,000 1,000

  12. Use your carefully set compass to draw a circle around each city. . 1,100km . . 2,800km 2,000km You've found the epicenter!

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