Fig. 2

Geological map of the Haslital, Aar Massif. Study area (box) and Grimsel Breccia Fault indicated. Lithologies after Stalder (1964) and Abrecht (1994); Alpine shear zone network after Baumberger (2015) and Wehrens (2015). Regional epicentres of earthquakes (magnitudes ranging from 0.1 to 2.5) recorded since 1971 (Swiss Seismological Service 2009; Deichmann et al. 2011, 2012; Diehl et al. 2013, 2014, 2015)