ABSTRACT
It is obvious that a sturzstrom represents a highly dynamic collisional granular regime (e.g. Bagnold 1954 and others). Particles not only collide but eventually crush each other. The fragmentationspreading model suggests fragmentation as a cause of the long run out of sturzstroms (Davies & McSaveney 2009). Fundamental research on the failure of rock (e.g. Harder 1992; van Vliet & van Mier 2000) reveals that energy is dissipated during fragmentation and that this should be considered
centrifugal experiments, which are not intended to test, or to deduce predictions on the run out of true sturzstroms; for the difference between induction and deduction (see e.g. Lauth & Sareiter 2005).
