Regional spherical models using CitcomS, a spherical finite element code developed by Moresi et al, 2000.
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| Subduction initiation and trench roll-back. | A group of tracers moving inside of a convection cell. | Two groups of tracers advected during subduction (side view) | Two groups of tracers advected during subduction (side view) | Two groups of tracers advected during subduction (top view) (trench roll-back) |
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| Mantle anisotropy | Tracers advection with multiprocessors | Slab-Plume interaction A | Slab-Plume interaction B | Preliminary paleoreconstruction for the Mexican Subduction Zone |
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| Mexican Geodynamic model | Mexican Plate Velocity | Slab detachment (cut off temperature ~900°C) | Slab detachment (cut off temperature ~900°C) | Preliminary geodynamic model for the Mexican Subduction Zone |
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Influence of a low viscosity layer (LVL) of various widths (0 km, 125 km, 380 km, and 500 km) on the subduction style. The thickness of LVL is 50 km. |
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Influence of a low viscosity layer (LVL) of various widths (0 km, 125 km, 380 km, and 500 km) on the subduction style. The thickness of LVL is 50 km. |
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Slab detachment and flat slab onset due to a low viscosity layer (w x h = 350 km x 50 km) |
Slab detachment caused by spreading center - trench collision |
Slab detachment onset - slow motion |
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| Kinematic (ocean plate velocity of 5 cm/yr and fixed overriding plate) and Dynamic subduction models with a weak zone (low viscosity fault) | Kinematic subduction models (ocean plate velocity of 5 cm/yr and fixed overriding plate) with (Right) and without (Left) a weak zone (low viscosity fault) | |||
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| Low Viscosity Layer with tracers | G-Plates | |||
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| Low Viscosity Moving Fault with tracers: CLICK for snapshots | Low Viscosity Moving Fault and Wedge with tracers | |||
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| G-Plates | Low Viscosity Wedge | Moving shallow low viscosity mantle wedge and flat subduction | Low viscosity mantle wedge: non-dimensional viscosity = 90 | |
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| Low viscosity mantle wedge: non-dimensional viscosity = 80 | Low viscosity mantle wedge: non-dimensional viscosity = 60 | Low viscosity mantle wedge: non-dimensional viscosity = 40 | Low viscosity mantle wedge: non-dimensional viscosity = 30 | Low viscosity mantle wedge: non-dimensional viscosity = 10 |
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| Low viscosity mantle wedge: non-dimensional viscosity = 5 | Low viscosity mantle wedge: non-dimensional viscosity = 0.5 | Low viscosity mantle wedge: non-dimensional viscosity = 0.1 | Mantle wedge viscosity influence on the subducting slab geometry | |
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| Global Subduction Model | Global Subduction Model | Global Subduction Model |
Low viscosity wedge - red curve No low viscosity wedge - blue curve |
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| No low viscosity wedge | Low viscosity wedge | |||
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http://www.gps.caltech.edu/~gurnis/Movies/movies-more.html
References:
Moresi, L., Gurnis, M., and Zhong, S., 2000. Plate tectonics and convection in the Earth's mantle: Toward a numerical simulation, Comput. Sci. Eng., 2, 22-33.
Webmaster Marina Manea
2005