Earth Sciences 1022A/B Lecture Notes - Ground Vibrations, Richter Magnitude Scale, Wind Wave

• School: Western University
• Department: Earth Sciences
• Course: Earth Sciences 1022A/B
• Professor: Prof

Document Summary

Earth sciences 1022b lecture brief 11 feb 14. Foreshocks and aftershocks accompany the main event with some earthquakes. Occurs below the spot plotted on a map called the epicentre. Slippage along a fault in the crust at the focus. Elastic-rebound builds up strain and the break/ rupture is the strain release rocks bent until they rupture then stress builds up and they start bending again. Foreshocks and aftershocks common with main event (mini earthquakes before and after the real thing) Seismic stations around the world indicate that earthquakes occur mainly at plate boundaries and are shallow, intermediate, deep (>300m); shallow most destructive. Record p, s wave arrival times, time difference on time-travel curves give the distance from the station to the epicentre. Plot distances from at least 3 stations as arcs; 3 arcs intersect at the epicentre (seismic station examples: montreal, paris, sao paulo)