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DOMAIN
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-4 km <= x <= +4 km
-4 km <= y <= +4 km

Mesh is tri3 cells with nominal 1 km discretization size.

AXIALDISP: See axialdisp_soln.py
  Axial extension
  No fault
  Dirichlet BC

SHEARDISP: See sheardisp_soln.py
  Shear
  No fault
  Dirichlet BC

SHEARDISPNOSLIP:
  Same as SHEARDISP
  Embedded fault w/zero slip

SHEARDISPNOSLIPREFINE:
  Same as SHEARDISPNOSLIP
  Uniform refinement

SLIPONEFAULT: See sliponefault_soln.py
  One through-going fault with uniform slip

SLIPTWOFAULTS: See sliptwofaults_soln.py
  Two through-going faults with uniform slip
