L06 Plate tectonics 2-1

L06 Plate tectonics 2-1 - GEOL 107 L6 9/2/2011 1 Plate...

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Unformatted text preview: GEOL 107 L6 9/2/2011 1 Plate Tectonics 2 Whats going on under the surface Distribution of Earthquakes black=shallow, green=intermediate, red=deep Shallow mostly associated with mid ocean ridges Intermediate/Deep mostly associated with trenches Wadati Benioff Zones GEOL 107 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 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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L06 Plate tectonics 2-1 - GEOL 107 L6 9/2/2011 1 Plate...

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