Use the information in the following Web site to answer the questions.
Introduction
1. Define earthquake.
2. Why do earthquakes occur?
Earthquakes in History
3. Give the magnitude of the New Madrid earthquake.
Where Earthquakes Occur
4. Where do most earthquakes occur?
5. Give one reason for intraplate earthquakes.
How Earthquakes Happen
6. Define seismic wave.
7. Which variable affects the speeds of seismic waves?
8. Define fault.
9. Describe the motion along a normal fault.
10. Describe the motion along a reverse fault.
11. Describe the motion alone a strike-slip fault.
12. Give the most common type of fault at different plate boundaries.
13. Define focus.
14. Give the ranges in depths for shallow, intermediate, and deep foci (more than one focus).
15. Give the depth of the deepest foci.
16. Where do most earthquakes occur vertically in the earth?
17. Give the radius of Earth.
18. Define epicenter.
Measuring Earthquakes
19. Contrast surface waves and body waves.
20. Which type of waves causes most property damage?
21. List the two types of body waves.
22. Which type of body wave is faster?
23. Define magnitude.
24. Which other ways can the size of an earthquake be measured?
25. Contrast the amplitudes (ground motion) of a magnitude 6 and a magnitude 7 earthquake.
26. Which factors affect how much destruction is caused by an earthquake?
Use the information in the following Web site to answer this question:
27. Contrast the motion of a primary wave, a secondary wave, and the two types of surface waves.