1. Class 6b: Earthquakes

2. Earthquake basics Stress relief via crust movement 500,000 per year; 800 felt

3. Earthquake basics Hypocenter: Epicenter:

4. Earthquake energy Waves of energy traveling through the earth Primary or P-wave

5. Earthquake energy Secondary or S-wave

6. Richter scale Measures magnitude via amplitude (height) of the seismic waves

7. World’s largest quakes Always at subduction zones

8. California’s largest quakes

9. We’re overdue! Can’t yet predict quakes, but…

10. Earthquake effects "Earthquakes don't kill people, buildings do“

11. Tsunamis Land displaced underwater (quake or slide)

12. Tsunami: Sumatra

14. Tsunamis in the U.S.?