A: Gravimetry anomalies after the N80W60 and N80E0 gravimetry maps of Sandwell et al. (2014). B: Depth (km) of the Mohorovicic discontinuity modified after Cloetingh et al. (2007). The high surface heat flow areas are defined from Figure 3B. LDCR: Low-Depth Crustal Region, URG: Upper Rhine Graben, BG: Bresse Graben, LG: Limagne Grabens, LRG: Lower Rhine (Roer Valley) Graben, NAPBD. North Armorica Paris Basin Domain, RBLTZ. Rhine-Bresse-Limagne Transfer zone, NED. North ECRIS domain, SED. South ECRIS Domain. B: Depth of the LAB AvF: Avallon Fault, BF: Bray fault, CHF: Chantonnay Fault, CHoF: Cholet fault, MzF: Metz fault, NASZ: North Armorican Shear Zone, NSE: Nort-Sur-Edre fault, SANSZ: South Armorican Northern Shear Zone, SeF: Seine Fault, SF: Sarre Fault, TF: Tonnerre fault, VF: Vittel fault, NAPBD. North Armorica Paris Basin Domain, RBLTZ. Rhine-Bresse-Limagne Transfer zone, NED. North ECRIS domain, SED. South ECRIS Domain.