An interesting set of ground penetrating radar (GPR) images were acquired during the surveying of the Pram Point Folds on the McMurdo section of the Ross Ice Shelf. Primarily, the images reveal internal layering and the brine layer within the ice shelf. Additionally, there are features that appear to be structures beneath the brine layer but are, in fact, the reverse or “mirror images” of the layering observed above the brine layer. The brine layer behaves like a mirror; not only do we see multiple reflections from the brine layer itself, as we would expect, but we also see multiple reflections of the energy from the overlying undulating beds as well. Here, we report these enigmatic features and explain the geometry of the occurrence of these “mirror-image” multiples.

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