EOSC 114 : DA EOSC 114 Learning Goals Earthquakes
13 Dec 2012
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Document Summary
Earthquakes occur where tectonic plates are either colliding or moving apart. Convergent type 1 boundary: largest earthquakes-subduction zone between oceanic and continental crust or oceanic-oceanic; reverse faults. Convergent type 2 boundary: small->large quakes- crumbling plates (neither subducting or plunging) between continent- continent; reverse faults. Divergent: small- moving apart (tension/stretching) occurs at mid-ocean ridges or spreading centers; normal dip-slip faults. Fault- region where rocks have broken over some area: dip-slip faults: vertical motion along a slanting plane; (1) Elastic rebound theory says that when two locked plates, which are bound under stress, pressure will build up, causing elastic strain. If the pressure continues, this will eventually result in brittle deformation, causing movement and a release of the stored energy. Strain: deformation (how materials change shape as a result of the stresses involved) Too much stress causes material to break. Catastrophic release of energy: sound, heat, motion. Tensional forces- those that cause a puling apart of material.
