GEOS 170A1 Lecture Notes - Lecture 9: Divergent Boundary, Convergent Boundary, Elastic Energy

• School: University of Arizona
• Department: Geosciences
• Course: GEOS 170A1
• Professor: Martin Pepper

Document Summary

Recap: very huge earthquakes = subduction (convergent boundaries, convergent boundaries have more earthquakes than divergent boundaries. They deform slowly and separate, releasing accumulated energy, and the rocks snap back to their original shape. Faults: types of motion - boundaries: transform, normal faulting - divergent, reverse fault (opposite of normal fault) - convergent. Eq size: magnitude: the largest eq happened in chile, magnitude: energy released, each # = 10x increase in ground motion (on the exam!, each # = 32x increase in energy released (on the exam!) Eq size: intensity: measure of damage that depends on many things, size of eq, distance from eq, population, building materials/codes, ground material. Intensity relates to magnitude and damage: subjective, relative to damage, depends on distance to eq. Eq and damage: many things contribute to damage, size of eq / distance / population / building materials / ground material / liquefaction, landslides, flooding (broken water mains, fire, liquefaction!