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How does the lag time change as you get farther and farther from the epicenter of an earthquake? (Use figure 2 graph photo to answer)

How does the lag time change as you get farther and farther from the epicenter of an earthquake? (Use figure 2 graph photo to answer)

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
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How does the lag time change as you get farther and farther from the epicenter of an earthquake? (Use figure 2 graph photo to answer)

**The Travel-Time Graph** Figure 2 is a seismic wave travel-time graph. It shows the time required for P and S waves to travel any distance up to 3000 miles. **The lag time for any distance = travel time for S waves – travel time for P waves.** For example, consider a seismograph stationed 3,000 miles from the epicenter of an earthquake. It takes S waves 14.7 minutes and P waves 8.3 minutes to travel 3,000 miles. Therefore, the lag time for any point that is 3,000 miles from the epicenter will be 14.7 – 8.3 minutes = 6.4 minutes. **Use Figure 2 to answer questions 6-9.** 6. How far do S waves travel in 5 minutes? What about P waves? 7. If your seismograph station is located 1,000 miles from the epicenter of an earthquake, how long will it take, to the nearest 0.1 minutes, for the first P waves to travel from the epicenter to your station? What about the S waves? 8. Based on your answers to the previous question, what is the lag time for locations that are 1,000 miles from the epicenter of an earthquake? 9. How does the lag time change as you get farther and farther from the epicenter of an earthquake? **Graph Explanation** - The graph in Figure 2 plots "Time in Minutes" on the y-axis against "Distance in Miles" on the x-axis, up to 3,000 miles. - Two lines are shown: - The upper line represents S waves, which increase in travel time as distance increases. - The lower line represents P waves, which also increase in travel time but less steeply than S waves. - The intersection of the vertical line at any distance point on the x-axis with these two lines gives the travel times for S and P waves, allowing calculation of lag time.
Transcribed Image Text:**The Travel-Time Graph** Figure 2 is a seismic wave travel-time graph. It shows the time required for P and S waves to travel any distance up to 3000 miles. **The lag time for any distance = travel time for S waves – travel time for P waves.** For example, consider a seismograph stationed 3,000 miles from the epicenter of an earthquake. It takes S waves 14.7 minutes and P waves 8.3 minutes to travel 3,000 miles. Therefore, the lag time for any point that is 3,000 miles from the epicenter will be 14.7 – 8.3 minutes = 6.4 minutes. **Use Figure 2 to answer questions 6-9.** 6. How far do S waves travel in 5 minutes? What about P waves? 7. If your seismograph station is located 1,000 miles from the epicenter of an earthquake, how long will it take, to the nearest 0.1 minutes, for the first P waves to travel from the epicenter to your station? What about the S waves? 8. Based on your answers to the previous question, what is the lag time for locations that are 1,000 miles from the epicenter of an earthquake? 9. How does the lag time change as you get farther and farther from the epicenter of an earthquake? **Graph Explanation** - The graph in Figure 2 plots "Time in Minutes" on the y-axis against "Distance in Miles" on the x-axis, up to 3,000 miles. - Two lines are shown: - The upper line represents S waves, which increase in travel time as distance increases. - The lower line represents P waves, which also increase in travel time but less steeply than S waves. - The intersection of the vertical line at any distance point on the x-axis with these two lines gives the travel times for S and P waves, allowing calculation of lag time.
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