Title: Expect the Unexpected: turbulence in Earth and planetary sciences

Abstract:
Small transient stress perturbations are prone to trigger earthquakes and a better understanding of the dynamics of earthquake triggering by transient stress perturbations is essential in order to improve our understanding of earthquake Turbulence is often viewed as a complex, small-scale process, that enhances mixing and dissipation in geophysical flows. From this perspective, it is frequently overlooked in studies of large-scale dynamics, and treated instead as a secondary effect that modifies model parameters—often through enhanced diffusion coefficients. However, in recent decades, a growing body of research has uncovered surprising ways in which turbulence actively shapes large-scale patterns, influences geophysical dynamics, and alters the timescales of critical processes. In this talk, I will explore these unexpected roles of turbulence, drawing from recent findings from different research groups as well as from our own studies using theory, numerical simulations, and laboratory experiments. I will discuss examples such as the emergence of large-scale structures in atmospheric flows, the turbulence-driven enhancement of particle collisions in multiphase systems, and its implications for electrification in volcanic plumes. These cases highlight the need to move beyond the classical view of turbulence as homogeneous and isotropic, instead considering its behavior in geophysical and planetary settings where diverse forces shape its effects.