1. EARTHQUAKES
Week 2

2. Questions For Discussion & Homework
Would you live in an earthquake zone? What level of risk from earthquakes is acceptable to you?
How would you know if the earthquake risk was assessed accurately?
What should be done by people and communities within an earthquake zone to prepare for the hazard and prevent catastrophe?

3. Earthquake Terminology

4. What causes earthquakes?
Elastic Rebound
Sources of stress
Plate Tectonics
Other stresses

5. Measurement Magnitude Intensity one per earthquake
related to energy released
Richter or Moment scale
Intensity
many for each earthquake
measure of effects
Mercalli scale

6. Damage: Causes Ground motion Duration of Shaking Surface Rupture
Poor building design

7. Effects
Rupture
Death
Bldg collapse

8. Effects
Fires
Liquifaction
Landslides

9. Damage: Key Factors Amount & duration of shaking Water content of soil
Population concentration
Building construction
Distance from Epicenter
Depth of focus
Direction of rupture
Material amplification

10. Addressing the Hazard
Identify areas at risk
Forecast

11. Addressing the Hazard
Structural adaptations
Warning systems

12. Questions For Discussion & Homework
Would you live in an earthquake zone? What level of risk from earthquakes is acceptable to you?
How would you know if the earthquake risk was assessed accurately?
What should be done by people and communities within an earthquake zone to prepare for the hazard and prevent catastrophe?