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: PEARSON
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Question

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? (Use Figure 2 graph 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 15 14 13 12 distance = travel time for S waves - 11 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 10 8 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. 4 Use Figure 2 to answer questions 6-9. 3 2 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? 50 1000 1500 2000 2500 3000 Figure 2. Travel-time graph Distance in Miles 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? Manteal Eoicenter S600 km Sdc Paulo Time in Minutes 400 km
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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 15 14 13 12 distance = travel time for S waves - 11 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 10 8 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. 4 Use Figure 2 to answer questions 6-9. 3 2 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? 50 1000 1500 2000 2500 3000 Figure 2. Travel-time graph Distance in Miles 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? Manteal Eoicenter S600 km Sdc Paulo Time in Minutes 400 km
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