Fig. 3: Amplitude-age graphs.
From: Shear margins in upper half of Northeast Greenland Ice Stream were established two millennia ago
Source data are provided as a Source Data file. a The centre of the figure shows the 3D visualisation of the 7150 years BP isochrone horizon as a hillshade to highlight the overall structure. b The graph on the lower left shows the mean normalised fold amplitudes vs. age for the two margins and the outside of NEGIS with shaded standard deviation. The sketch to the right shows the origin area of the mean amplitude values. Subfigures show fold amplitude vs. age at fold locations for three selected across-flow radar profiles. Black dotted lines in subfigures represent a linear fit to the data points from 2000 years BP until today and then extrapolated to older ages. Letters U, C, and D (Upstream, Central and Downstream) and numbers (increasing from left to right) indicate folds and their locations.
