Examination of the basic assumption of stress tensor inversion methods

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Stress tensor inversion methods are widely used to estimate the earth's crustal stress state from fault-slip orientations. The methods are based on an assumption that the slip directions of faults are consistent with the regional stress state. This study examined the assumption through numerical experiments. As a result, a significant dispersion of slip directions was found, which is also supported by natural fault-slip data. The inversion methods should be designed so as to take the dispersion into account.