GEOL 104 Lecture 25: GEOL104 Lecture 25.26

• School: Queen's University
• Department: Geological Sciences and Geological Engineering
• Course: GEOL 104
• Professor: Daniel Layton- Matthews

Document Summary

Geol104 lecture 25. 26 earthquakes and mass wasting. Earthquake belts: most earthquakes occur in narrow zones, circum-pacific belt, mediterranean sea region to himalayan complex, oceanic ridge, occur at most types of plate boundaries (continental, subduction, transform, subduction steepness affect. Surface area of the plate portion subducting to form the. Less dense, not very old, young, hot, doesn"t want to subduct. Surface area of plate portion subducting, much narrower portion. Denser subducting crust, very old and cold: volcanic activity in hawaii initiates the earthquakes. Measuring the size of earthquakes: two measurements. Measure of the degree of earthquake shaking at the local. Estimates amount of energy released at source: intensity scales. Destruction may not be a true measurement of the earthquakes actual severity. Good to know where to send help, good for insurance: magnitude scales. Based on amplitude of largest seismic wave recorded. Accounts for decrease in amplitude with increased distance. Gets info out faster (i. e. to news stations)