 Complete the following phrase:  General seismic risk in France is categorised on a five-point scale, with zone 1 being very low risk, through to zone 5 in areas with a very strong risk. In Metropolitan France the areas of highest risk are rated at 4, strong, and are located in the Pyrenees, Alps, the south of the Haut-Rhin département, the Territoire de Belfort and a few communes in Doubs. A new zoning map comes into force on 1 May 2011, which significantly increases the rating for many areas. The major nuclear research facilities at Cadarache are located in a zone 4 area near the fault that caused the 1909 Lambesc earthquake, while the Marcoule research centre and the nuclear power plants at Tricastin, Cruas, Saint-Alban, Bugey and Fessenheim near the fault that caused the 