This session focuses on the rheology of geomaterials governing deformation in the subsurface of Earth and other planetary bodies, including the cryosphere of icy worlds. It brings together studies of rocks and ice across a wide range of temperatures, pressures, strains, and strain rates. We welcome theoretical, laboratory, and numerical contributions spanning deformation regimes from elastic-wave dispersion and attenuation to large-strain behavior.

The session aims to advance understanding of the processes controlling subsurface rheology and their role in large-scale phenomena such as earthquakes and tectonic deformation. Emphasis will be placed on poroelasticity and poro-visco-elasto-plastic behavior in porous and fractured materials, as well as frictional processes, plasticity, thermodynamic disequilibrium, and intrinsic viscoelasticity.

The goal is to promote cross-disciplinary exchange and enable upscaling from laboratory and numerical results to geophysical and planetary scales.

• C - Cryosphere
• EP - Earth and Planetary Surface Processes
• T - Tectonophysics
• V - Volcanology, Geochemistry and Petrology