Different models in segments

Different models in segments#

Slabs and faults can be heterogeneous in depth. This is very easy to represent in the World Builder. The segments we just added allow for defining temperature and compositional models that overwrite the temperature and compositional models for the whole feature. You can think of it this way (remember the painting analogy!): you set the feature models for each segment in the feature (line 54 and 55) and then you overwrite that feature model in the segments where you want something else.

In this case we want to have two layers in the first segment where the upper layer is the same as the upper layer of the oceanic plate and the lower layer is the same as the rest of the subducting plate. This layout is mainly chosen to highlight how the transition between the oceanic plate can both be seamless and sharp.

Important lines

    { 
      "model":"subducting plate", "name":"Slab", "dip point":[0,0],
      "coordinates":[[1500e3,1000e3],[1600e3,350e3],[1500e3,0]],
      "segments":
        [
          {"length":300e3, "thickness":[100e3], "angle":[0,60],
           "composition models":[
            {"model":"uniform", "compositions":[3], "max distance slab top":50e3},
            {"model":"uniform", "compositions":[2], "min distance slab top":50e3}]},
          {"length":500e3, "thickness":[100e3], "angle":[60,20]}
        ],
      "temperature models":[{"model":"plate model", "density":3300, "plate velocity":0.02}],
      "composition models":[{"model":"uniform", "compositions":[2]}]
    }

BST_14_different_models_in_segments.wb

../../_static/gwb_input_files/BST_14_different_models_in_segments.wb

BST_14_different_models_in_segments.grid

../../_static/gwb_input_files/BST_14_different_models_in_segments.grid

Paraview v3 state file

../../_static/paraview_state_files/BST_v3.pvsm

Full file

{
  "version": "1.0",
  "coordinate system":{"model":"cartesian"},
  "features":
  [
    {
       "model":"mantle layer", "name":"upper mantle", "max depth":660e3,
       "coordinates":[[-1000e3,0],[-1000e3,1000e3],[3000e3,1000e3],[3000e3,0]],
       "composition models":[{"model":"uniform", "compositions":[4]}]
    },
    {
       "model":"oceanic plate", "name":"Overriding Plate", "max depth":100e3, 
       "coordinates":[[0,0],[0,1000e3],[1500e3,1000e3],[1600e3,350e3],[1500e3,0]],
       "temperature models":
         [
           {"model":"half space model", "max depth":100e3, "spreading velocity":0.04, 
            "ridge coordinates":[[[400e3,-1],[-100e3,2000e3]]]}
         ],
       "composition models":[{"model":"uniform", "compositions":[0], "max depth":50e3}]
    },
    {
       "model":"continental plate", "name":"Passive margin", "max depth":[[200e3]], 
       "coordinates":[[-1000e3,0],[-1000e3,1000e3],[0,1000e3],[0,0]],
       "temperature models":
         [
           {"model":"linear", "max depth":[[100e3],[200e3,[[-250e3,0],[-750e3,1000e3]]]]}
         ],
       "composition models":
         [
           {"model":"uniform", "compositions":[3], 
            "max depth":[[100e3],[200e3,[[-250e3,0],[-750e3,1000e3]]]]},
           {"model":"uniform", "compositions":[1], 
            "min depth":[[100e3],[200e3,[[-250e3,0],[-750e3,1000e3]]]]}
         ]
    },
    {
      "model":"oceanic plate", "name":"Subducting Oceanic plate", "max depth":100e3, 
      "coordinates":[[2000e3,0],[2000e3,1000e3],[1500e3,1000e3],[1600e3,350e3],[1500e3,0]],
      "temperature models":[{"model":"linear", "max depth":100e3}],
       "composition models":[{"model":"uniform", "compositions":[3], "max depth":50e3},
                             {"model":"uniform", "compositions":[1], "min depth":50e3}]
    },
    { 
      "model":"subducting plate", "name":"Slab", "dip point":[0,0],
      "coordinates":[[1500e3,1000e3],[1600e3,350e3],[1500e3,0]],
      "segments":
        [
          {"length":300e3, "thickness":[100e3], "angle":[0,60],
           "composition models":[
            {"model":"uniform", "compositions":[3], "max distance slab top":50e3},
            {"model":"uniform", "compositions":[2], "min distance slab top":50e3}]},
          {"length":500e3, "thickness":[100e3], "angle":[60,20]}
        ],
      "temperature models":[{"model":"plate model", "density":3300, "plate velocity":0.02}],
      "composition models":[{"model":"uniform", "compositions":[2]}]
    }
  ]
}