The estimation of the stress‐field orientation from focal mechanisms of earthquakes is a relevant tool to understand crustal mechanics and the physics of earthquakes. In global seismology, Formal Stress Inversion (FSI) is a well‐established technique to study tectonic processes associated with the occurrence of large earthquakes (e.g., Hardebeck and Michael, 2004; Yoshida et al., 2012). Information on the stress‐field orientation is also relevant for the exploitation of hydrocarbon and geothermal reservoirs. Knowledge of the orientation of the maximum horizontal stress (σHmax) is crucial for reservoir development, such as drilling and leakage risk assessment (...

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