This session explores current advances and emerging directions in geodynamics and complexity in Earth and planetary systems, including mantle convection, lithospheric deformation, planetary dynamics, scaling relationships, and nonlinear processes. Contributions are invited that address fundamental processes, integrate observations, theory, and numerical modelling, and examine links across temporal and spatial scales.

Talks in this session will exemplify and expand on the work of Donald Turcotte (1932-2025), whose contributions helped shape modern geodynamics and complexity science in the geosciences. His influential books, including Geodynamics (with Gerald Schubert), Fractals and Chaos in Geology and Geophysics, and Mantle Convection in the Earth and Planets (with Gerald Schubert and Peter Olson), have guided generations of researchers and students and helped connect geodynamics with scaling, fractals, and nonlinear Earth system behaviour. We particularly welcome contributions that reflect the continued influence of these ideas in advancing understanding of Earth and planetary dynamics.

• A - Atmospheric Sciences
• G - Geodesy
• IN - Informatics
• S - Seismology