EARTHQUAKES Week 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?

Earthquake Terminology

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

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

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

Effects Rupture Death Bldg collapse

Effects Fires Liquifaction Landslides

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

Addressing the Hazard Identify areas at risk Forecast

Addressing the Hazard Structural adaptations Warning systems

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?