This paper presents a generic modeling approach to estimate the possible static and dynamic effects of an earthquake on a deep repository for spent nuclear fuel. 3D models, including a discrete fault plane and numerous surrounding fractures, are analyzed dynamically with 3DEC. An algorithm to control the rupture initiation and the following propagation along the fault plane is developed. Model geometries, the mechanical properties of fault and rock, and the in-situ stresses are calibrated to

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... e the intended seismic moment. M5 and M6 events are simulated with models where the complete fault plane is included (full 3D models). In order to simulate larger earthquakes (M7.5), quasi-3D models with truncated fault planes are developed. The relevance and conservativeness of the models are assessed by comparison of the resulting fault movement and ground motions with data found in the literature.