   
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

Freeslip

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

Freeslip

128×384×64 × 2

190^{b}

0.09

Internal & bottom ^{c}

g
l
o
b
a
l4

Spherical

Free

128×384×64 × 2

190^{b}

0.09

Internal & bottom ^{c}


^{a}In addition to a brittle, depthdependent yield stress (see “Global model” section for more details)

^{b}Given 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 nondimensional depth ranging from 0 (top) to 1 (bottom)

^{c}Using an isothermal bottom boundary with a nondimensional temperature of T
_{bot}=1.0