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Progress in Earth and Planetary Science

Table 3 Global model setups

From: Subduction initiation from a stagnant lid and global overturn: new insights from numerical models with a free surface

    

Constant

  
  

Top

 

yield stress a

Friction

 
 

Box

boundary

Resolution

(σ y,const)

coefficient

Heating

Tag

geometry

condition

(n x×n y×n z × n b)

[MPa]

(μ)

mode

g l o b a l1

Cartesian

Free-slip

2048×1×256

21.7

0.005

Purely internal

g l o b a l2

Cartesian

Free

2048×1×256

21.7

0.005

Purely internal

g l o b a l3

Spherical

Free-slip

128×384×64 × 2

190b

0.09

Internal & bottom c

g l o b a l4

Spherical

Free

128×384×64 × 2

190b

0.09

Internal & bottom c

  1. aIn addition to a brittle, depth-dependent yield stress (see “Global model” section for more details)
  2. bGiven is the surface value that increases with depth according to σ y,ductile=σ y,const+Δ σ y ·d, where Δ σ y =0.025 and d is the non-dimensional depth ranging from 0 (top) to 1 (bottom)
  3. cUsing an isothermal bottom boundary with a non-dimensional temperature of T bot=1.0
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