Sessions

Four themes will be addressed:

Short-term dynamics of the subduction

What parameters (force balance, mantle flow, temperature, density, rheology...) control the dynamics of the subduction zone? Under what conditions can a stable regime be reached? What are the effects of a perturbation (shallow/deep earthquake, pore pressure / density change…) on the short-term dynamics of the subduction? How do the changes in the subduction dynamics affect the loading of the megathrust?

What's down there? Observations from geology and geophysics

What are the main structural and geophysical features of the subduction? Variability of structures, slip modes and earthquakes characteristics on world-wide subduction zones? How does the structure of the down-going plate, the roughness of the subduction interface promotes or hinders slow/fast slip? What do geological observations of fossil earthquakes (slow or fast) or fluid transportation tell us about the processes at stake, their size and kinetics? Any changes in seismic velocities or gravity with time?

The subduction seismic (super-) cycle

What interactions between interseismic loading, seismic ruptures and slow slip? Is interseismic loading transient? How long does the post-seismic relaxation last, and what are the key parameters to be taken into account in the models? Can we extend the spatial and temporal ranges of observation of the earthquake cycle?

Slow to fast earthquakes

What have we learned from the study of great megathrust earthquakes and from two decades of slow slip observation? Slow slip and earthquakes: different processes or continuum? Spatial and temporal link between slow slip and regular earthquakes?