Marshall, H. P.Harper, J. T.Pfeffer, W. T.Humphrey, Neil2024-02-082024-02-082002-12-14https://wyoscholar.uwyo.edu/handle/internal/1610https://doi.org/10.15786/wyoscholar/9734Detailed three-dimensional in-situ measurements of deformation at depth are used to examine the rheology of a 6 x 106 m3 block of temperate glacier ice. Assuming that the viscosity of this ice is primarily dependent on stress, the relationship between inferred stress and measurements of strain-rate above similar to 115 m depth suggest a constitutive relationship with a stress exponent n similar to 1. Deformation below 115 m is described by a non-linear flow law with a power exponent of approximately 3-4. A sharp transition between the two flow regimes is likely caused by a change in the dominant mechanism from superplastic flow, basal slip, and/or diffusional flow near the surface to dislocation and intragranular deformation at depth.enghttps://creativecommons.org/licenses/by/4.0/Geologyjournal contribution10.1029/2002GL015412