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SEISMIC WAVE BASICS.

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Presentation on theme: "SEISMIC WAVE BASICS."— Presentation transcript:

1 SEISMIC WAVE BASICS

2 Finding an Epicenter

3 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.

4

5 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

6 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

7 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

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

9 TAKE A PIECE OF PAPER, AND MARK OFF THE DIFFERENCE IN ARRIVAL TIME
4:10 2800Km

10 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

11 EPICENTER DISTANCES San Francisco: 4:10 Denver, Colorado: 3:20
2,800km Denver, Colorado: 3:20 2,000km Missoula, Montana 2:00 1100km

12 Recording Board Difference in arrival times:
San Francisco: 41:0 2,800km Open your compass to the EXACT distance on the scale. 1,000 2,000 3,000 4,000 5,000

13 . . . Use your carefully set compass to
draw a circle around each city. . . . You've found the epicenter!


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