Subduction zones are characterized by a remarkably wide range of interrelated seismic and tectonic styles: from silent slip events to giant megathrust earthquakes, subduction erosion versus accretion, transient and permanent deformation. To understand the interplay between seismogenic and tectonic processes and to better interpret the related deformation signals it is important to observe, record, and model subduction processes across temporal scales from days to millions of years and spatial scales from metres to plate boundary. In order to identify the threats and processes underpinning earthquake rupture, the geosciences community needs to progressively close the gap between short- and longterm studies. This session aims to bring together scientists from the fields of geology, geophysics and geodesy who are inverstigating subduction plate boundaries. We especially welcome multidisciplinary investigations and studies integrating cross-scale data sets and approaches with implications for seismic hazard assessment.