Abstract
Based on geometrical and statistical analyses, a procedure for determining the principal stress axes associated with a set of conjugate fault slip data is proposed. It is worthwhile to analyze conjugate fault patterns first, because they are extremely abundant in outcrops and provide a key to deciphering fault tectonics. Each fault slip datum is characterized by the normal to fault plane and the stria (as shown by slickenside lineations). The program CONJUG calculates the orientation of related stress axes with numerical outputs. A parameter defining the homogeneity of the data set helps the user to estimate the quality of the data set and to identify the faults that can be described as conjugate. Because this program aims at studying conjugate fault systems, other fault slip data are not used in the determination. A subroutine for a simple cluster analysis of data enables “bad” data to be ignored in the final determination of the orientation of the principal stress axes.
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