Inversion of stresses from polyphase fault/slip data with high or low diversity: An updated version of INVSFS |
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Authors: | Yehua Shan Ye TianWenjiao Xiao |
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Affiliation: | a Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou City 510640, PR China b State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing City 100029, PR China |
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Abstract: | Fault/slip data with low diversity show limited range in orientation, and their equations, according to the Wallace-Bott hypothesis often give rise to an unstable stress solution. It is necessary in this case to introduce some auxiliary constraint(s), so as to make a stable stress solution from these equations. A new method for inverting stress from polyphase fault/slip data with low diversity but having all or a majority of newly formed faults in each subset is developed in this paper. It combines a weak criterion that favors the newly formed faults, together with the Wallace-Bott hypothesis or the strong criterion. Both criteria are solved for stresses using the Fuzzy C-lines clustering analysis technique. This permits the updating of the INVSFS code (Li et al., 2005). Two artificial sets of polyphase fault/slip data with high and low diversity are chosen to demonstrate the performance of the updated version. |
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Keywords: | fault/slip data Polyphase Low diversity Sigma space Stress inversion |
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