Kinesiology 1080A/B Lecture Notes - Lecture 17: Outer Core, Epicenter, Hypocenter
13 Nov 2014
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Document Summary
Slippage along a fault in the crust at the hypocentre. Occurs below the spot plotted on a map called the epicentre. Elastic rebound: rocks bend until they rupture (earthquake), then stress builds up and they start bending again. Shear (starts with up and down motion), secondary (s), slower. 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. Righter scale: based on energy released by the earthquake. Each number 10 times largest wave amplitude or about 32 times the energy of the last number. At material boundaries part of the seismic wave is reflected, part refracted. Wave speeds up or slows down crossing the boundary. Mantle core: p slows down and s waves disappear in liquid outer core.
