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Fig. S1. Observed and modeled LOS displacements from (A) descending orbit, and (B) ascending orbit across the Pinto Mountain fault (profile BB ′ ). Models assume faultnormal extension of 0.6 MPa, and a factor of 2 reduction in the shear modulus within the fault zone (G ′ = 16.5 GPa) compared to the host rocks (G = 33 GPa). Red dots correspond to a model of a fault zone that is unlimited with depth, and blue dots correspond to a model of a fault zone that terminates at depth of 2 km. Data from the ascending orbit are noisy due to temporal decorrelation of the radar images.

[1] The primary goal of the Ice, Cloud and land Elevation Satellite (ICESat) mission is ice sheet elevation change detection. Confirmation that ICESat is achieving its stated scientific requirement of detecting spatially-averaged changes as small as 1.5 cm/year requires continual assessment of ICESat-derived elevations throughout the mission. We use a GPS-derived digital elevation model (DEM) of the salar de Uyuni, Bolivia for this purpose. Using all twelve ICESat passes over the salar survey area acquired to date, we show that the accuracy of ICESat-derived elevations is impacted by environmental effects (e.g., forward scattering and surface reflectance) and instrument effects (e.g., pointing biases, detector saturation, and variations in transmitted laser energy). We estimate that under optimal conditions at the salar de Uyuni, ICESatderived elevations have an absolute accuracy of <2 cm and precision of <3 cm. Citation: