Open Session - SWISS GEOSCIENCE MEETINGs

While uncertainties yet prevail with respect to the topographic basis and hazard mapping in general, the overall methodology
has proven to be a suitable tool to provide a first overview of spatial distribution of risk, helpful for decision-makers. We
should consider, however, that the weighting of the different vulnerabilities has an important control on resulting risks and
should therefore be performed in coordination with the responsible authorities.
Figure 1. Cordillera Central with Nevado del Tolima and Nevado del Ruiz (from Huggel et al., 2007).
Figure 2. Flow chart of the risk analysis concept based on a R=V*H approach.
REFERENCES
Huggel, C., Ceballos, J.L., Pulgarín, B., Ramírez, J. & Touret, J.-C. 2007: Review and reassessment of hazards owing to volcanoglacier
interactions in Colombia. Annals of Glaciology, 45, 128-136.
Thouret, J.-C., Cantagrel, J.-M., Robin, C., Murcia, A., Salinas, R. & Cepeda, H. 1995: Quaternary history and hazard-zone
model at Nevado del Tolima and Cerro Machin Volcanoes, Colombia. Journal of Volcanology and Geothermal Research,
66, 397-426.
Varnes, D.J. 1984: Landslide hazard zonation: a review of principles and practice. United Nations Educational, Scientific and
Cultural Organisation, Paris. 63 pp.
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Symposium 9: Natural Hazards and Risks