Rock glacier dynamics : implications from high-resolution measurements of surface velocity fields

Recent high-resolution measurements of surface velocity fields using terrestrial, airand spaceborne methods have deepened insight into the dynamics of rock glaciers. Here, we compare selected studies on surface velocity fields in order to identify basic processes involved in the development of rock glacier surfaces. The evolution of rock glacier geometry is shown to be a function of mass advection, 3-dimensional straining, and thaw settlement or frost heave, respectively. All of these processes can reach the same order of magnitude. Available studies revealed creep fields to be highly coherent in space, clearly pointing to the presence of stresstransferring ice in the ground. The magnitude and type of dynamic processes reflect a high thermally-induced inertia of the creeping mountain permafrost. Systematic globally distributed monitoring series are identified as a major requirement for future research. Permafrost, Phillips, Springman & Arenson (eds) © 2003 Swets & Zeitlinger, Lisse, ISBN 90 5809 582 7

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