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Earthquake Waves - Finding the epicenter 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) 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. ____________________ 3) Which seismic waves travel the slowest? ___________________ 4) How many seismic stations are needed to determine the epicenter of an earthquake? ________ 5) Explain the difference between the focus and the epicenter of the earthquake.______________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ 6) Which type of seismic wave can travel through liquids, solids, and gases? _______________ Using Figure 6-2 and 3 above, answer the following questions. 7. At which time did the first P wave arrive in Sitka? _________________ 8. At which time did the first S wave arrive in Sitka? ______________________ 9. What is the difference in time between the first P and S waves at Sitka? _______________ 10. Use Figure 8-1 to determine how far Sitka was from the epicenter of the earthquake in kilometers. _____________________________ Use Figure 1-1 to answer the following questions. 11. Which 2 elements make up the core of the Earth?_______________________________ 12. What is layer C called? _________________ 13. What is layer D called?__________________ 14. What name is given to the crust and uppermost part of the mantle? _________________________