Fig. 3: Swath image of the Hercules Dome subglacial valley with spectral roughness orientation.
From: Scars of tectonism promote ice-sheet nucleation from Hercules Dome into West Antarctica
a, An overview of radar data collected at Hercules Dome. b–e, Spectral analysis of local subglacial topography in the glacier highlands (c,d) and valley floors (b,e). Each Fourier-analysed panel (b, c, d, e) corresponds to different areas shown and labeled in the map view (a). Black solid lines in Fourier-analysed panels of each outlined domain denote wavelength (in metres), and black dashed lines indicate orientation (azimuth with 45° marking northwest–southeast features and 135° marking northeast–southwest features). Colours capture the power (decibels) of spectral energy relative to the direction of the survey.
