Sketch of the fault network at Soultz-sous-Forêts (modified after ([Sausse et al. 2010])). The F fault where evidences of aseismic slip have been reported by ([Cornet et al. 1997]) and ([Bourouis and Bernard 2007]) is added in red. It is located on the top of the reservoir. It intersects GPK1 at 2,925 m with a strike of N138°E and a dip of 86°NE. Seismicity is observed along this fault down to the major fault FZ-4770 (N234°E, 71°W).