Multi-hazard risk mapping and assessment on an active volcano: the GRINP project at Mount Cameroon |
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| Authors: | Pierre Thierry Laurent Stieltjes Emmanuel Kouokam Pierre Nguéya Paul M Salley |
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| Institution: | (1) Development Planning and Natural Risks Division, BRGM ARN/RSC, 3 av. C. Guillemin BP36009, Orleans Cedex 2, 45060, France;(2) Department of Mines and Geology, Ministry of Industry, Mines and Technological Development, Yaounde, Cameroon |
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| Abstract: | To help improve the safety of its population faced with natural disasters, the Cameroon Government, with the support of the
French Government, initiated a programme of geological risk analysis and mapping on Mount Cameroon. This active volcano is
subject to a variety of hazards: volcanic eruptions, slope instability and earthquakes. Approximately 450,000 people live
or work around this volcano, in an area which includes one of Cameroon’s main economic resources. An original methodology
was used for obtaining the information to reply to questions raised by the authorities. It involves several stages: identifying
the different geological hazard components, defining each phenomenon’s threat matrix by crossing intensity and frequency indices,
mapping the hazards, listing and mapping the exposed elements, analysing their respective values in economic, functional and
strategic terms, establishing typologies for the different element-at-risk groups and assessing their vulnerability to the
various physical pressures produced by the hazard phenomena, and establishing risk maps for each of the major element-at-risk
groups (population, infrastructures, vegetation, atmosphere). At the end of the study we were able (a) to identify the main
critical points within the area, and (b) provide quantified orders of magnitude concerning the dimensions of the risk by producing
a plausible eruption scenario. The results allowed us to put forward a number of recommendations to the Cameroon Government
concerning risk prevention and management. The adopted approach corresponds to a first level of response to the authorities.
Later developments should make it possible to refine the quality of the methodology. |
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| Keywords: | Mount Cameroon Multi-hazard geological risk mapping Vulnerability assessment Landslides Volcanic risk Earthquakes |
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