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Dear colleagues, Apologies for cross-posting. We would like to draw your attention to the session "/Rock rheology, deformation transients, and the earthquake cycle" /at the upcoming GeoBonn meeting (*Bonn, Germany, 2-6 September 2018*). The session description is given below. Please note that the deadline for abstract submission is *Tuesday, May 15th*. Rock deformation at depth in the Earth’s crust and Upper Mantle is typically governed by thermally activated viscous creep. Extensive laboratory studies and quantitative field observations allowed formulating robust constitutive equations for major crustal and upper mantle rocks. However, key questions such as whether the ductile roots of faults are concentrated in weak narrow shear zones or broad regions of bulk ductile flow, how the rheology of shear zones affects the temporal evolution of stress and surface strain during the earthquake cycle and the nature of coupling between elastic and ductile lithosphere have not yet been fully addressed. This also holds for the seismic and geodetic signatures of slip transients along plate-bounding faults that have been reported over the last decade suggesting that deformation at depth may be governed by a complex interplay of non-steady state processes. For this session, we invite contributions that address field observations, numerical modelling and laboratory studies of rock deformation. Invited Keynote speaker is *Michel Campillo*. Looking forward to seeing you in Bonn. Georg Dresen, Livia Nardini, Bernard Schuck, Erik Rybacki (GFZ Potsdam, Germany) and Steven Miller (Centre d'hydrogéologie et de géothermie, Université de Neuchâtel)