Earth Sciences 2123F/G Lecture Notes - Lecture 13: Fokker E.Ii, George Biddell Airy, Curie Temperature
11 Apr 2016
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Document Summary
Earthquake: sudden, violent dislocaion in the subsurface caused by stress buildup on a fault. Tectonic forces build up, & stresses in crustal blocks. Stresses become too large for crustal rocks to sustain. When rocks slip suddenly, energy is released in waves that travel through earth"s crust and cause shaking. Time sequence of reid"s elasic rebound theory: before eq: stress accumulates by tectonic forces, during eq: stress released by moion on a. Immediately ater eq: crust rebounds to an unstressed equilibrium posiion: following equilibrium: stress re-accumulates (tectonism = coninuous) Fault: sfc (plane) across which 2 blocks can move relaive to one another. Allow blocks to move relaive to each other. Plate boundaries and associated fault: divergent normal, compressional thrust (reverse, transform strike-slip. Dipping (subducion) zone of eqs are found as deep as 660km in the mantle. Earthquakes: elasic energy released when one block of rock moves suddenly past another block. Epicentre: point on the earth"s sfc directly above the hypocentre.
