Slow earthquakes represent a mode of self-sustained fault rupture in which slip 
accelerates slowly but does not reach rates sufficient to radiate high-frequency seismic 
energy. The widespread occurrence of slow earthquakes in different tectonic settings and in some cases also during human induced seismicity 
suggests a generic mechanism that may differ from many of those proposed thus far. Although existing models can explain slow-slip transients under certain conditions or for specific frictional rheologies, many fundamental questions remain. For example, what determines the fault slip speed and rupture propagation velocity in slow earthquakes and in other forms of quasi-dynamic rupture? What processes limit stress drop in slow earthquakes? How do slow and regular earthquakes interact in space and time, and what is the geologic record of slow earthquakes? We welcome multidisciplinary contributions that shed light into the physics of slow earthquakes and the spectrum of fault slip behaviors.