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Reading P wave and S wave Travel Time Graph
Part I: Answer the questions below using the Earthquake P-wave and S-wave Travel
Time Graph
1. According to Figure 8-1, what is the distance (in miles) between the seismic station
and an earthquake epicenter, if the first S wave arrives 3.0 minutes after the first
P wave?
2. According to Figure 8-1, what is the distance (in miles) between the seismic station
and an earthquake epicenter, if the first S wave arrives 2.0 minutes after the first
P wave?
3. Use the graph in Figure 8-1 to determine the difference in the travel-times
between the first P wave and the first S wave, if the seismic station is 2000
kilometers from the epicenter.
4. Use the graph in Figure 8-1 to determine the difference in the travel-times
between the first P wave and the first S wave, if the seismic station is 3000
kilometers from the epicenter.
5. Which seismic waves travel the slowest?
6. How many seismic stations are needed to determine the epicenter of an
earthquake?
7. Explain the difference between the focus and the epicenter of an earthquake.
8. Which type of seismic wave can travel through solids, liquids, and gases?
Part II: Analyze the images below and answer the questions.
1. In Dallas, how long did it take the P wave to arrive?
2. In Dallas, how long did it take the S wave to arrive?
3. At which time did the first P wave arrive in Sitka?
4. At what time did the first S wave arrive in Sitka?
5. What is the lag time of the P and S wave in Sitka?
6. Using the P wave and S wave time graph, what is the distance of the earthquake
of Sitka?
7. At which time did the first P wave arrive in Columbia?
8. At what time did the first S wave arrive in Columbia?
9. What is the lag time of the P and S wave in Columbia?
10. Using the P wave and S wave time graph, what is the distance of the earthquake
of Columbia?
11. At which time did the first P wave arrive in Honolulu?
12. At what time did the first S wave arrive in Honolulu?
13. What is the lag time of the P and S wave in Honolulu?
14. Using the P wave and S wave time graph, what is the distance of the earthquake
of Honolulu?
Part III: REVIEW…Answer the questions using the image below
1. What two elements make up most of the Earth’s core?
2. What is layer B called?
3. What is layer C called?
4. What is the name given to the crust and uppermost part of the mantle?