EPS 20 L09 - Plate tectonics Global seismicity Plate...

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1 Plate tectonics Reading: Bolt Ch 7 p142-152 Plate tectonics Plate tectonics Global seismicity Plate tectonics: Plate tectonics Global bathymetry Plate tectonics: Plate tectonics The plates Plate tectonics: 14 plates Larger plates: North American Eurasian Pacific Antarctic South American African Australian The plates are rigid, all the deformation occurs at the edges Who is at risk from major earthquakes? Plate tectonics Reconstructing plate motion The magnetic tape recorder: Given the oceanic record we can wind back the plates to see how the plates have been moving. Plate tectonics: age of the ocean floor We can reconstruct past plate motion Pangaea supercontinent Plate tectonics Categories of plate boundaries Divergent • Established mid-ocean ridge • New rift zone, new ocean Transform • Along mid-ocean ridges • Across continents Convergent • Ocean – continent • Ocean – ocean • Continent – continent Plate tectonics: What types of fault?
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2 Plate tectonics Categories of plate
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