Version 1.03 for Windows
Fault Slip Analysis Made Easy
Analyze fault and slip geometry and calculate the stresses causing slip
MyFault™ is an easy-to-use Windows application for analyzing fault and slip geometry and calculating the stresses that lead to the formation of these structures.
- Slickenside measurements
- Earthquake nodal plane solutions
- Earthquake P-T axes
- Compression and tension fractures (not for stress analysis)
MyFault gives you a large variety of formats for entering the values. You can even mix formats and data types in the same data file. (See Data Editor and Data Loader)
Explore Fault Properties
With the program, you can make fully customizable plots to examine your data:
- Scatter plots, with statistics and regression analysis
- Histograms, with statistics
- Stereonets, with principal direction analysis and point-density contouring
- Rose diagrams, with principal direction analysis and expected frequency statistics
- Mohr diagrams, when the stresses have been calculated
You choose which features or variables to plot, both measured and computed, including the results of the stress analysis. You can examine the interrelationships between features, their statistical properties and orientation distribution.
All the plot characteristics can be saved as templates to standardize your presentations. You can even direct MyFault to create plots automatically when you load a new data file, a good time- and effort-saver.
Estimate Stresses for Fault Slip
You can calculate the stresses that may have produced the faults using one of several published methods of stress inversion. MyFault lets you switch easily between the various methods and options and compare the results. Each method has its own set of assumptions and procedures which may or may not be valid for your particular field situation. All methods use the same data set, user interface and calculation options, although some methods may have additional options particular to themselves. MyFault calculates errors using the 'bootstrap' technique (sampling with replacement), with user-selected level of confidence.
The inversion techniques currently included with the program are:
- Minimizing the non-slip shear stresses (one of Angelier's
methods)
- Minimizing the misfit of principal stresses, using a failure criterion (Reches' method)
- Minimizing the variation of shear stresses (Michael's method)
- Tensor averaging of fault stress couples (similar to Spang's and Turner and Weiss' methods)
- Minimizing non-slip shear stresses (Fry's hyperplane
method)
The program is open-ended, so additional inversion methods can easily be linked in as the coded modules become available.
Earthquake nodal solutions are handled by solving for the stresses once using all possible planes, then iteratively removing the worst of each pair. You can choose the number of node-picking iterations.
Also included are a plot of the averaged right dihedra (grey/black contours) for estimating the stress directions, and the approximate shortening or extension direction (dark red star), estimated from the intersection of the movement planes (Arthaud's method).
MyFault provides lots of calculation results, including the World
Stress Map quality rank (original and modified).
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