In this paper, the surface fault displacement hazard at the Choman dam is evaluated by a new approach of probability fault displacement hazard analysis (PFDHA). For this, fault map and fault characteristics of area are determined based on the aerial photographs, satellite image, and field studies. In this study, Piranshahr fault is divided into two segments of Piranshahr-Sardasht and Sardasht-Penjwen from across point of Armardeh fault. The empirical relationships proposed for strike-slip fault is applied to estimation of probability fault displacement hazard curve of Choman dam. The return periods of 10000 and 35000 years are selected for estimation of fault displacement for different earthquake design levels. Finally, fault displacement for Design Basic Earthquake (DBE), Maximum Design Earthquake (MDE) and Safety Evaluation Earthquake (SEE), 20, 30 and 65 cm are proposed.

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