Lecture 5 - PlateTectonics

Lecture 5 - PlateTectonics - Lecture 5 Plate Tectonics...

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Unformatted text preview: Lecture 5 Plate Tectonics Seismic Wave Travel Times V p V s K = bulk modulus u = shear modulus Why do seismic waves follow curved paths? Continental Drift Alfred Wegener came up with the idea that continents had drifted apart in 1915 suggested there was once a supercontinent that he termed Pangaea (all lands) problem was that Wegener did not have a mechanism for drift of the continents Pangaea was a supercontinent that existed ~200 million years ago Evidence for Pangaea Wegener noted that the following features matched on continents now separated by the Atlantic ocean: fossils rock types/ages similar geologic structures glacial deposits Mesosaurus Fossils Wegeners matching of mountain ranges on different continents glacial deposits indicate ice flow away from a central location (south pole) Plate tectonics More encompassing than continental drift Associated with the lithosphere Lithosphere consists of several plates Plates are moving slowly Continents move with ocean floor Movement ultimately driven by uneven deep Earth heat distribution Earths Plates Earths outer shell is made up of 13 major plates (and numerous smaller plates) M 7.0 (Haiti) Plate Tectonics and Earthquakes Convection and Plate Tectonics Heat Source 3-3 Driving Mechanisms for Plate Motions Destructive Margins Subduction Zones Constructive Margins Mid-ocean Ridges...
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This note was uploaded on 01/26/2012 for the course EAS 2600 taught by Professor Ingalls during the Fall '08 term at Georgia Institute of Technology.

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Lecture 5 - PlateTectonics - Lecture 5 Plate Tectonics...

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