The paper presents a new method, based on rigorous principles of mechanics, for determining the in-situ rock stress state based on hydraulic fracturing data. A solution can be obtained from a single data set which includes breakdown pressure, fracture angular position and trace angle. The inversion methodology is demonstrated on a case history from the Kuparuk River field, Alaska as reported by  and is shown to give good agreement with observed field data.
International Journal of Rock Mechanics and Mining Sciences Vol. 48, Issue 3, p. 476-481