Growth and Decay of Boundary Undulations26

Growth and Decay of - 12.005 Lecture Notes 26 Growth and Decay of Boundary Undulations Growth Rayleigh Taylor Instability salt domes diapirs

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12.005 Lecture Notes 26 Growth and Decay of Boundary Undulations Growth: Rayleigh - Taylor Instability • salt domes • diapirs • continental delamination X 3 λ = λ 0 cos η u , u η l , l = λ 0 coskx 2 ± x 1 ² X 1 Figure 26.1 Figure by MIT OCW. General problem: topography on an interface 2 π ξ = 0 cos kx 1 k = λ t / τ (1) If ρ < l topography decays as 0 e . u (2) If > l topography grows. u t / Initially = 0 e . Eventually many wavelengths interact, problem is no longer simple. Characteristic time depends on , η u , l , thickness of layers, …
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Figure 26.2. Subsidence due to glaciation and the subsequent postglacial rebound. Ice Sheet Before glaciation Subsidence caused by glaciation Surface after melting of the ice sheet but prior to postglacial rebound Full rebound Figure by MIT OCW. Weight of ice causes viscous flow in the mantle. After melting of ice, the surface rebounds – “postglacial rebound”. Different regions have different behaviors (e.g., Boston is now sinking).
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X 3 X 1 Air m ± = ² 0 coskx Figure 26.3 Figure by MIT OCW.
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This note was uploaded on 10/25/2010 for the course MIT Geodynamic taught by Professor Ywn during the Fall '10 term at MIT.

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Growth and Decay of - 12.005 Lecture Notes 26 Growth and Decay of Boundary Undulations Growth Rayleigh Taylor Instability salt domes diapirs

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