Vertical geodesy is undergoing a revolution because of two factors. First, new precise three-dimensional position measurement techniques used over very long distances and based on extraterrestrial reference systems provide a new class and precision of geometric data previously unavailable for geophysical investigations. Second, physical models in tectonic theory for large earthquakes predict cr...

Dilatancy plays a key role in mixtures of grains and fluid but is poorly investigated dry granular flows. These flows may however dilate by more than 10% column collapses. We investigate here dilatancy effects with shallow depth-averaged model designed to be further applied simulate natural landslides. use compressible μ(I), ϕeq(I) rheology law, where the volume fraction at equilibrium (i.e. cr...

We study the shearing of polydisperse and bidisperse media with a size ratio of 10. Simulations are performed with a two-dimensional shear cell using contact dynamics. With a truncated power law for the polydisperse media we find that they show a stronger dilatancy and greater resistance to shearing than bidisperse mixtures. To model additives used to control viscosity we introduce so-called "p...