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EPSC 201 Section 4 - 04_01bc Continents float in oceanic...

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Plate tectonics – the theory for how Continental Drift works 200 million years 135 million years 65 million years Today
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Seafloor magnetic anomalies and Plate Tectonics
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The origin of seafloor magnetic anomalies - reversals of the Earth’s magnetic field.
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Reversals of Earth’s magnetic field Normal polarity Reversed polarity
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Dating Magnetic reversals
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Sea-floor spreading
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03_23.jpg Sea-floor spreading Subduction
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Divergent plate boundaries and mantle up-welling Convergent plate boundaries and subduction
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W. W. Norton Heat-flow: Evidence for mantle up-welling
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Mantle convection and Plate Tectonics
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Controls on spreading and subduction Slab push and slab pull
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Distribution of Mid-ocean ridges, fractures and trenches
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Distribution of World’s Volcanoes
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Distribution of Earthquake foci Trend from shallow to deep focus earthquakes - subduction
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Distribution of earthquakes along a subduction zone
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Crustal plates
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04_11.jpg
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Pangea Rodinia 400 Ma – 180 Ma 1100 Ma – 700 Ma Supercontinents
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Unformatted text preview: 04_01bc.jpg Continents float in oceanic crust Density of continental crust = 2.7 Density of oceanic crust = 3.1 Initiation of subduction The fate of subducted slabs Transform faults Samoa Tsunami September 29, 2009 Earthquake magnitude 8.3 strikes Kermadec-Tonga subduction zone enerates tsunamis up to 6.6. m high >150 people killed in Samoa and American Samoa 2004 Earthquake 2009 Earthquake Padang Earth Quake October 1 2009 Death toll > 529 Magnitude 7.6 500 Buildings collapse (hospitals, schools) Thousands of peopled trapped Transform faults Transform faults and plate boundaries The San Andreas transform fault Hot spot volcanoes Hot spots and mantle plumes Hot spots and mantle plumes Interpretation of plate motion from hot spots Rates of plate motion Continental Rifting The African Rift Valley Zoomable Art: Theory of Plate Tectonics Plate tectonic summary Plate tectonic summary...
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