TEKTON finite element geodynamics code, originally written by H.J. Melosh and A. Reafsky, and updated by A. Freedman and M.T. Bland, among others, with explanation and example problems.
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TEKTON Fortran Finite Element Code and Documentation
Melosh, H. J., & A. Raefsky (1980). The dynamical origin of subduction zone topography. Geophysical Journal, 60, 333–354. https://doi.org/10.1111/j.1365-246X.1980.tb04812.x