Factorization of finite strains in three dimensions—a computer method

Strain analysis using deformed objects is already well established. The more sophisticated techniques can resolve tectonic strains and indicate the nature of any pre-tectonic fabric. Methods that analyse in two dimensions can produce problems of incomparability when results from three faces of one sample are combined.A method for factorizing finite, non-coaxial strains is presented which overcomes these problems by analysing in three dimensions. Published data from deformed lapilli tuff from the English Lake District have been used to test the method.Results are as valid as those obtained originally from the data, and the technique enables strain analysis to be extended to areas which give imprecise results using existing methods.