Fold Simulations

These simulations represent part of the output from the high-amplitude folding program described in the following reference:

Cruikshank, K.M. & Johnson, A.M. 1993. High-amplitude folding of linear-viscous multilayers. Journal of Structural Geology, 15(1):79-94.

I will put a copy of the manuscript online as soon as I translate the equations to MathML.

If there is enough interest I will make available ASCII versions of the data files and subroutines to read animation files. This will let you write your own viewer, for your own system. Please e-mail me (CruikshankK@pdx.edu).

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The programs work from the command line (e.g.animate layer-10.ffb), however you will be prompted for a filename if yo do not provide one on the command line.

The graphics is somewhat crude, but it does allow you to see what is going on.

• Simulation viewer (MS-DOS)
• Data files for Single Layer folds ( Viscosity contrast = layer viscosity/media viscosity)

• Viscosity contrast of 10 (free-slip contacts)
• Viscosity contrast of 10 (bonded contacts)
• Viscosity contrast of 20 (free-slip contacts)
• Viscosity contrast of 30 (free-slip contacts)
• Viscosity contrast of 40 (free-slip contacts)
• Viscosity contrast of 50 (free-slip contacts)
• Viscosity contrast of 50 (bonded contacts)
• Viscosity contrast of 100 (free-slip contacts)

• Data files for multilayer: Interbedded stiff and soft layers

• Confined by soft media
• Confined by stiff media

• Data files for multilayer: Multilayer of stiff beds

• Confined by soft media
• Confined by stiff media
• Stiff media above, soft media below

• Plotting programs

This set of programs creates plot files in a variety of formats from the animation files.

• Plots frames from animation in AutoCAD DXF format
• Plots frames from animation in PostScript format
• Plots frames from animation in HPGL format