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Granular packings under constant shear stress display below the Coulomblimit, a logarithmic creep dynamics. However the addition of small stressmodulations induces a linear creep regime characterized by an effective viscousresponse. Using Diffusing Wave Spectroscopy, we investigate the relationbetween creep and local plastic events spatial distribution ("hot-spots")contributing to the plastic yield. The study is done in the two regimes, i.e.with and without mechanical activation. The hot-spot dynamics is related to thematerial effective fluidity. We show that far from the threshold, a localvisco-elastic rheology coupled to an ageing of the fluidity parameter, is ableto render the essential spatio-temporal features of the observed creepdynamics.

Spatial repartition of local plastic processes in different creep regimes in a granular material