1. EARTHQUAKES Shake, Rattle and Roll! https://www.youtube.com/watch?v=CtBXTvtFaCU https://www.youtube.com/watch?v=VSgB1IWr6O4

2. What is an Earthquake? The shaking, rolling or sudden shock of the earth’s surface Occur when rocks under stress suddenly shift along a fault. Rarely last even 1 minute yet are responsible for the greatest number of lives lost (and property damage) due to a natural event!

3. Elastic Rebound Theory: Rocks that are strained past a certain point will fracture and spring back to original shape. As rock return to new positions, energy is dissipated into the surrounding medium through seismic waves

4. Three Types of Faults Strike-SlipNormal Thrust

5. Where do earthquakes occur? Is it random? Is any place safe or free of earthquakes?

6. Epicenter vs. Focus

7. Focus: Area along a fault where slippage first occurs. Deep in Earth Epicenter: Point on Earth’s surface directly above the focus.

8. Earthquake Depths

9. Major Earthquake Zones Most earthquakes occur along or near edges of the Earth’s lithospheric plates. Three Major Earthquake Zones: 1. Pacific Ring of Fire 2. Along mid ocean ridges 3. Eurasian-Melanesian mountain belt

10. Major Earthquake Zones Pacific Ring of Fire

11. Major Earthquake Zones Mid Ocean Ridge

12. Major Earthquake Zones Eurasian-Melanesian Belt

13. Fault Zones Groups of interconnected faults Form at plate boundaries because of great stress. Plates separate, collide, subduct or slide past each other. Ex. San Andreas Fault Zone

14. Recording Earthquakes