“…For example, 1) Straight and parallel reflectors concordant with a basal one express low longitudinal deformation and/or vertical compaction; 2) Chaotic reflectors may reflect local downwasting and perturbation of the shallow structure; 3) Undulating and toplapping reflectors; and 4) upward-or rock glacier center-dipping reflectors rather evocate the occurrence of compressive stresses and thrusting. Indeed, undulating and toplapping reflectors are well known in rock glacier deformation structures (e.g., Degenhardt et al, 2003;Monnier et al, 2008), and the dipping reflectors observed here are analogous to GPR signatures given by thrust planes in glaciotectonized sediments (Overgaard and Jakobsen, 2001;Sadura et al, 2005) or by debris inclusions in glacier ice (Woodward et al, 2003) and debris-covered glacier ice structures in rock glaciers (Fukui et al, 2008).…”