EATS1010 - The Dynamic Earth and Space Geodesy Lecture 5

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York University
Earth, Space Science and Engineering
ESSE 1010
Gary Jarvis

Lecture 5 Earth Crust - Oceanic – 6km - Continental – 35km Radius – 6400km Core - Inner – 1200km - Outer – 2300km Mantle - Upper – 700km - Lower – 2200km Physical Basis of Plate Techtonics • The Upper and Lower Mantle are Viscous solids • The Lithosphere is a Brittle solid • Distinction between Viscous and Brittle behavior is fundamental to understanding Plate Techtonics Classification of Eath material Conventional terminology Basic of Classification: Response to applied force Solids: maintain their form (rigid, hard), no relative displacement of internal particles Liquids: Relative displacements of internal particles indicate the internal flow properties or Rheology of material Rheology: flow properties of material Rheology Behaviour Example Brittle Fractures Glass, chalk Elastic Stretches Rubber band Viscous (or ductile) Deforms toothpaste Rheological Classification • Basis of Classification: Net response to short term forces Brittle Elastic Viscous Force Response Applied Fracture Displacement Displacement Removed No change Oscillations No change Net R.D.’s X X Check Viscoelasticity • Mo
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