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The transition from linear to nonlinear dynamical elasticity in rocks is ofconsiderable interest in seismic wave propagation as well as in understandingthe basic dynamical processes in consolidated granular materials. We havecarried out a careful experimental investigation of this transition for Bereaand Fontainebleau sandstones. Below a well-characterized strain, the materialsbehave linearly, transitioning beyond that point to a nonlinear behavior whichcan be accurately captured by a simple macroscopic dynamical model. At evenhigher strains, effects due to a driven nonequilibrium state, and relaxationfrom it, complicate the characterization of the nonlinear behavior.Comment: 4 pages, 4 figure

Nonlinear and Nonequilibrium Dynamics in Geomaterials