Subduction zones host a wide range of dynamic processes spanning multiple spatial and temporal scales. Furthermore, they are often spatially correlated with high density population centers, and therefore pose significant societal and economic hazard and risk. In this session, we invite contributions from a range of disciplines examining subduction zone processes and dynamics, including earthquakes and seismicity (upper- and lower-plate earthquakes and interface events), slow earthquakes (e.g., episodic tremor and slip) from seismic and geodetic data, geophysical imaging of subduction zone structures, numerical modeling of subduction zone dynamics, ruptures, and earthquake cycle deformation, laboratory and experimental studies of subduction zone materials’ properties, the source, the impact, and the destination of fluids across the subduction system, as well as implementation of earthquake early warning systems. In this session, we will focus predominantly on the Cascadia Subduction Zone, including its transition to other tectonic regimes at its north and south boundaries, but welcome studies of other subduction zones globally.