subsection Material model
  set Model name = visco plastic

  subsection Visco Plastic
    set Reference temperature = 1573.15
    set Heat capacities       = 1000
    set Densities             = 3300           # Value from Behn et al., 2007
    set Thermal expansivities = 0              # Thermal buoyancy is ignored in Behn et al., 2007
    set Define thermal conductivities = true
    set Thermal conductivities        = 3.5
  end
end
