Journal of Glaciology
Experiments have shown that tensile ductility of about 5% or more can be imparted to columnar, saline ice by pre-compressing the material by about 3.5%. This effect is similar to that observed in granular, fresh-water ice and is attributed to the operation of both dislocation creep and diffusion creep within that part of the matrix which recrystallized during the pre-compressive deformation.
Kuehn, G. A. and Schulson, E. M., "Ductile Saline Ice" (1994). Open Dartmouth: Faculty Open Access Articles. 2660.