Fig. 1: Area and outline of the radar survey.
From: Shear margins in upper half of Northeast Greenland Ice Stream were established two millennia ago
a, b Maps of the survey area and radar lines with ice flow velocity11. NG: Nioghalvfjerdsfjorden Glacier, ZI: Zachariae Isstrøm, SG: Storstrømmen Glacier. Radar profile, PC is shown in panel (d) and in Figure 2b, PU and PD are shown in Fig. 2a,c. C stands for Centre, D for Downstream and U for Upstream. c 7.3 ka BP isochrone horizon as a shaded relief above bedrock64 (10 times vertical exaggeration). F1-F4 indicate the location of fold anticlines also highlighted in the radar profile PC in panel (d). The location of PC is indicated by a yellow line. d Profile PC across Northeast Greenland Ice Stream (NEGIS) in the centre of the survey area. F1-F4 indicate the anticlines highlighted in panel c.
