Fig. 5

Relative relocations for shallow earthquakes listed in the SED catalogue from 2000 to 2021 in map view a and along a depth-profile (b), oriented perpendicular to the strike of the focal planes. Note that the depth range focuses on the uppermost crust with only events with focal depths < 3 km BSL shown in the profile. No vertical exaggeration has been used for the cross section profile, thus the projection represents true dip angles. Relocations were obtained using the hypoDD algorithm of Waldhauser and Ellsworth (2000) using Singular-Value-Decomposition (SVD) inversion. Error bars indicate the horizontal and vertical relative location uncertainties derived by the SVD inversion. The gray, dashed line indicates the approximate top-basement at ~ 0.9 km depth BSL as inferred by integrating data from geological formations thickness of the area (Nussbaum et al., 2017) as well as the closest borehole logs in the NE (Weber et al., 1986) and in the SW of Saint-Ursanne (Rime et al., 2019)