Earths Dynamic Systems Hamblin

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Global Tectonics I-The Mobile Planetor why I
stopped worrying and learned to Love Seismic
Waves.
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Gravity Isostasy

• Gravity is a fundamental force of nature
• A constant force in every system on Earth
• Isostasy
• Gravitational adjustment of the crust

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Global Tectonics

• Plate Tectonics
• A unifying theory explaining internal dynamics of
  the Earth
• Study of processes that form and deform the
  Earths crust
• Delineation of discrete lithospheric plates
• Developed in the mid-1960s some evidence known
  earlier

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• Driving Forces
• Earths internal heat source
• Radioactive decay residual heat
• Heat transfer by convection
• Hot, less dense material rises from the mantle
• Cool, more dense material descends from the crust

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• Divergent Plate Boundaries
• Plates moving apart

• Convergent Plate Boundaries
• Plates moving toward one another

• Transform Plate Boundaries
• Plates move laterally past each other

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Cascadia Suduction Zone-local Plate Tectonics
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The Red Sea and East African Rift System.