A) Compaction rate as a function of melt fraction for C423 of Renner et al. (2003). Green curve represents the predicted compaction rate at a given melt fraction calculated using a composite GBD and repacking rheology. The parameters obtained to constrain the repacking rheology are obtained by fitting the compaction model to the olivine centrifuge experiments using eq. (16). The parameters used to constrain the GBD rheology (eq. (20)) include the melt fraction at which the crystal matrix disaggregates and the matrix shear viscosity, here equal to 0.62 and 1012.21, respectively. Here, the total compaction rate is the sum of the compaction rate associated with GBD and repacking, respectively. The porosity or melt fraction range between densest packing and random close packing of spheres is shown in grey. B) The compaction rate associated with either GBD or repacking normalized by total compaction rate.