~1X. The highest resolution models resolve about 20 discrete LLVAs below the usual LVZ.

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Presentation transcript:

~1X

The highest resolution models resolve about 20 discrete LLVAs below the usual LVZ

Heated from below gives narrow upwellings and broad downwellings. Cooling from the top and internal heating give the opposite. Fig. 11. Numerical simulation of convection in a fluid with viscoelastic rheology and a yield stress showing temperature (top) and the second invariant of stress rate (bottom). For a suitable range of Rayleigh number and yield stress the surface velocity, vx, breaks up into a number of distinct ‘plates’.

Heated from below gives narrow upwellings and broad downwellings. Cooling from the top and internal heating give the opposite. Fig. 11. Numerical simulation of convection in a fluid with viscoelastic rheology and a yield stress showing temperature (top) and the second invariant of stress rate (bottom). For a suitable range of Rayleigh number and yield stress the surface velocity, vx, breaks up into a number of distinct ‘plates’. Hawaii ridge superswell

Ridge Related Upwellings Shallow lateral flow (fingers) either away from ridges (ridge centered upwellings) or toward ridges/thin spots (off axis upwellings).

Cooled from above…

Low sound speed(?) but dense

1, Hawaii; 2,Samoa; 3, Marquesas; 4, Tahiti 5, Pitcairn; and 6, Macdonald.

Hawaii Galapagos Easter

fingers superswell 42 S.Of Alaska W. Of Calif. -2% +3%

Downwellings?

cold warm cool cold Most hotspots, backtracked LIPs & kimberlites fall within the ~ -2% contour surrounding ridges (p=10 -8 ) Harvard In spite of being ‘passive’, ridge-related upwellings are not ambient or ‘representative’ shallow mantle Dziewonski&Ekstrom

Hawaii Tonga ridge 800