EARTHSC 2GG3 Lecture Notes - Lecture 5: Plate Tectonics, Oceanic Crust, Mercalli Intensity Scale

• School: McMaster University
• Department: Earth Sciences
• Course: EARTHSC 2GG3
• Professor: Sergei Basik

Document Summary

There can be long/short fractures in the crust. Earthquakes involve an elastic rebound of previously stored elastic stress. Stress and strain are released during the earthquake when the plate breaks. Earthquakes and faults are associated with plate boundaries. Strike/slip faults are associated with transform boundaries (tectonic boundaries) Revers/thrust faults are associated with convergent boundaries (areas with huge earthquakes plates coming together) Normal faults are associated with divergent boundaries (plates going away from each other) (only know this slide not what is in the textbook) Primary waves: push and pull the rock they go through, happen in the crust not on the surface. Secondary waves: slower, can change the structure of the rock they go through, in the upper crust. Important to know the time between p and s waves. Can use it to time the intervals between the arrivals of p and s waves. Can use this info to locate the epicenter of the earthquake.