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Knowledge of the in-situ primary stresses in the subsurface is an essential prerequisite for the design of underground structures with regard to their dimensioning and long-term stability. The only method for direct measurement of in-situ stresses is the hydraulic fracturing (HF) or hydraulic testing of pre-existing fractures (HTPF) method. For both methods, a test section is isolated in a borehole with hydraulic packers and then the fluid pressure is increased in the measurement interval until either