Slow fault slip plays a fundamental role in releasing tectonic stress and modulating seismic hazard across various tectonic settings, including subduction zones, transform boundaries, continental fault systems, and collision margins. Decades of observations have shown that slow slip is often associated with seismic moment release (low-frequency earthquakes, tectonic tremor, regular earthquakes). Together, they seem to outline a continuum of moment release, from slow, distributed aseismic slip to seismically observable fast and localized slip acceleration. However, these slow-and-fast slip components are not equally represented in every slow-slip-prone area, and the seismic and geodetic parts of these phenomena are not always perfectly correlated in space and time. This suggests a multiscale organization of slow fault slip whose complexity may be underpinned by structural and chemical heterogeneities of the underlying materials.

This session aims to explore how and why slow slip becomes seismic, to improve our understanding of the dynamics of tectonic moment release in slow-slip-prone areas, from shallow to deep plate interfaces. We welcome contributions building towards a multidisciplinary understanding of the spatiotemporal variability of slow slip and its interactions with (a)seismic events, employing geodetic and seismic data, geological records, laboratory experiments, and modeling, as well as emerging technologies such as machine learning and distributed acoustic sensing (DAS).