Hazard mapping in mountainous areas at the regional scale has greatly
changed since the 1990s thanks to improved digital elevation models
(DEM). It is now possible to model slope mass movement and floods
with a high level of detail in order to improve geomorphologic mapping.
We present examples of regional multi-hazard susceptibility mapping
through two Swiss case studies, including landslides, rockfall, debris
flows, snow avalanches and floods, in addition to several original
methods and software tools. The aim of these recent developments
is to take advantage of the availability of high resolution DEM (HRDEM)
for better mass movement modeling. Our results indicate a good correspondence
between inventories of hazardous zones based on historical events
and model predictions. This paper demonstrates that by adapting tools
and methods issued from modern technologies, it is possible to obtain
reliable documents for land planning purposes over large areas.