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Slide 4 of 18

 

NOTES:

We collected our own data sets, they were not taken from past data sets. We also utilized existing maps of the fault. However, there was discrepancy concerning the location of the fault trace.
My mentor and I would take field measurements of deformation structures in order to conduct stress analyses.
Small faults can occur through bedding or through cobbles. We measure strike, dip, dip direction, rake and rake direction of the fault surface. If calcite crystalizes on the fault surface, growth crystals can show the direction of slip.
Cobble deformations are another type of deformation structure. A sufficient number of these strain measurements can be used to orient the maximum principal stresses.
After collecting measurements, we preformed data manipulations. We used two methodologies to analyze the given data.
FaultKin is a program written by Richard Allmendinger and is based on a stress inversion method by Angelier [1977]. The regional compression and extension axes are found using a linked Bingham distribution to find a best fit for the total data set.
The Michael [1984] analysis uses a program, named Andy, written by John Armbruster. Michael [1984] assumes that if the tangential traction can be determined on a variety of planes in an area, then it may be possible to infer the stresses responsible for faulting.