Tectonism, volcanism, seismicity, and related surface processes record how solid planetary bodies evolve and how their interiors interact with their surfaces. This session brings together comparative studies of geological processes across Earth, the terrestrial planets, and solid planetary bodies including the Moon, Mars, Venus, Mercury, Enceladus, Europa, Ganymede, and Io. Rather than organizing contributions around individual planets or missions, we aim to examine common processes and their contrasting expressions across different worlds. Particular emphasis is placed on tectonic deformation, volcanism and cryovolcanism, seismicity, surface deformation, erosion and sedimentation where these processes interact with endogenic activity, and the links between surface geology and planetary interiors.

Terrestrial analogues form an important part of this comparative approach. We therefore welcome contributions combining planetary remote sensing and geophysical observations with terrestrial field studies, structural geology, geomorphology, analogue experiments, numerical and kinematic modelling approaches. Studies that compare similar processes on multiple planetary bodies or use Earth observations and experiments to understand planetary processes are particularly encouraged.

By bringing together Earth and planetary geoscientists, the session aims to develop a process-oriented framework for understanding why similar geological mechanisms produce different landforms and evolutionary pathways across solid planetary bodies.