Download Earthquake Waves worksheet

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? _________________________