Steady mass shift as well as catastrophic mass-movement events are the natu
ral expression of the dynamics of high-mountain mass-transport systems, cau
sing a variety of natural hazards. Computer-aided aerial photogrammetry, es
pecially a newly developed technique for determining surface velocity field
s in 3D, offers a wide range of possibilities to map disasters and hazard p
otentials, to monitor medium- and long-term development of dangerous situat
ions and to provide area-wide boundary conditions for 2D- and SD-modelling
of kinetic and dynamic processes. Three pilot studies in the Swiss Alps ill
ustrate the potential of high-precision and multi-temporal image analysis f
or early recognition of glacial and periglacial hazards: (1) The increasing
risk of lake-outbursts and related debris-flows (up to several 10(5)m(3))
was detected by a 25-year monitoring series of glacier geometry, ice flow,
permafrost creep and changes of glacier-lakes. (2) Analyzing permafrost cre
ep above a potential starting zone of debris flows allowed for assessing ma
ss transport and accumulation rates in this zone. (3) The kinetic processes
and the extent of a rock slide (similar to 10(6) - 10(7)m(3)), induced by
a marked retreat of a glacier tongue and the related stress-relief at the v
alley flanks could be determined. (C) 2000 Elsevier Science Ltd. All rights
reserved.