Abstract
Granitic rock masses contain fracture systems that consist of a number of fracture sets. Within a fracture set, variability in orientation is defined by strike and dip. Orientation data have been studied by discriminant analysis for the accurate determination of the fracture set. This method yields a function for classifying multivariate observations into groups. Particular discontinuities named ‘individuals’ are assigned to a population, based on the proximity relations between individual and most likely clusters initially defined. For each cluster recognized, the preferential direction is determined by means of elementary matrix calculation. The preferred orientations are finally connected to the major features of brittle tectonics.
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