To investigate the internal structure of a rock glacier in the eastern
Swiss Alps, traveltime and amplitude tomographic inversions have
been applied to borehole georadar data. Pronounced variations of
electromagnetic velocity at the study site required a nonlinear inversion
algorithm to be applied. Traveltimes and amplitudes provided complementary
subsurface information, such that a joint analysis of the resulting
velocity and attenuation tomograms allowed an enhanced interpretation
of the data. Features resolved included two distinct zones of enriched
ice content, a sharp transition between frozen and unfrozen material,
and a highly attenuating zone within the bedrock.