Proceedings of the 12th International INQUA meeting on paleoseismology, active tectonic and archaeoseismology

of the copper canisters due to rock movements induced by large earthquakes. The discovery of glacially induced faulting during the deglaciation of the Weischelian ice sheet implied that large earthquakes could occur as a response to the changing stress field with the waxing and rapidly waning of an ice sheet (Lagerbäck and Sundh, 2008, and references therein). For many decades several claims have been made that the deglaciation caused a sudden burst of intense tectonic activity in large parts of Sweden (figure 1). These claims needed to be addressed not only by SKB but also by SSM since it call into question if the present seismic stability in the Fennoscandian shield could be extrapolated over several glacial cycles, the time period that the passive safety system of the repository needs to be in function. Present paper aims at describing the planning and execution of SSM’s seismological review in order to discuss lessons learnt that can be applied to the reviewof other safety cases when it comes to assessing seismic hazard, particularly in stable intracontinental regions. Fig. 1. From Mörner (2003). Grey areas are claimed to represent postglacial paleoseismicity, many of which occur below the highest postglacial shoreline in densley vegetated areas. Red dot marks the approximate location of the planned spent nuclear fuel repository in Sweden.