L06 Plate tectonics 2-1

L06 Plate tectonics 2-1 - GEOL 107 Ͳ L6 1 Plate Tectonics...

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Unformatted text preview: GEOL 107 Ͳ L6 9/2/2011 1 Plate Tectonics 2 What¡s going on under the surface¢ Distribution of Earthquakes black=shallow, green=intermediate, red=deep Shallow Ͳ mostly associated with mid ocean ridges Intermediate/Deep Ͳ mostly associated with trenches Wadati Ͳ Benioff Zones GEOL 107 Ͳ L6 9/2/2011 2 Key Observations from Earthquakes • Shallow earthquakes are associated with mid ocean ridges • Deep Earthquakes are only associated with trenches Distribution of Volcanoes Hot Spots Plate Tectonics: A Unifying Theory • The outer portion of the earth is broken into ¡plates¢ GEOL 107 Ͳ L6 9/2/2011 3 Plate Tectonics: A Unifying Theory • New oceanic crust is created at mid ocean ridges – magma wells up to fill the crack as the plates diverge – magnetic stripes on seafloor demonstrate that the crust ages away from the ridge crest – Shallow earthquakes – Later observation of volcanic activity along ridge axis Plate Tectonics: A Unifying Theory • Plates are ¡recycled¢ at trenches where they...
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This note was uploaded on 11/21/2011 for the course ECON 404 taught by Professor Carrillo during the Spring '11 term at USC.

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L06 Plate tectonics 2-1 - GEOL 107 Ͳ L6 1 Plate Tectonics...

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