Regional spherical models using CitcomS, a spherical finite element code developed by Moresi et al, 2000.


 

 

A

B

 

C

 

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)

Mantle anisotropy Tracers advection with multiprocessors Slab-Plume interaction A Slab-Plume interaction B Preliminary paleoreconstruction for the Mexican Subduction Zone

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

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. 


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. 


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


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)

Low Viscosity Layer with tracers  G-Plates

Low Viscosity Moving Fault with tracers: CLICK for snapshots Low Viscosity Moving Fault and Wedge with tracers

G-Plates Low Viscosity Wedge Moving shallow low viscosity mantle wedge and flat subduction Low viscosity mantle wedge: non-dimensional viscosity = 90 

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

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

Global Subduction Model Global Subduction Model Global Subduction Model Low viscosity wedge - red curve
No low viscosity wedge - blue curve 

     
No low viscosity wedge Low viscosity wedge      

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.


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