Fig. 3
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Interpolated maps of surface heat flow data. A: modified from Lucazeau and Vasseur (1989), and B: interpolated from The Global Heat Flow Database: Update 2023. For more details on heat flow data extrapolation, see Annexe 1. The white dashed lines correspond to the heat zone contours, thick and thin dashed line correspond respectively to large-scale and small-scale heat flow anomaly. LFHZ : Low Frequency Heat zone, SHHZ: Sillon Houiller Heat Zone, BHZ: Burgundy Heat Zone, URHZ: Upper Rhine Heat Zone.
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