A new approach to assess long‐term lava flow hazard and risk using GIS and low‐cost remote sensing: the case of Mount Cameroon, West Africa

Bonne, K.; Kervyn, Matthieu; Cascone, Lorenzo; Njome, S.; Ranst, Éric Van; Suh, Cheo Emmanuel; Ayonghe, Samuel N.; Jacobs, Patric; Ernst, Gérald

doi:10.1080/01431160802167873

Cited by 43 publications

(51 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With a sub-aerial volume of ∼1,300 km3, Mt Cameroon is one of the largest continental volcanoes and the most active volcano of West Africa with at least 7 eruptions in the last hundred years (Fitton 1983;Suh et al 2003;Njome et al 2008). Recent lava flows (Suh et al 2003), tectonic earthquakes (Ateba 2009), landslides (Ayonghe et al 2004) and lake out-gassing (Freeth and Kay 1987) events in SW Cameroon have caused casualties and damage to property and infrastructure, highlighting the need to assess volcano-related hazards in this densely populated region (Bonne et al 2007;Thierry et al 2008).…”

Section: Introductionmentioning

confidence: 98%

Field evidence for flank instability, basal spreading and volcano-tectonic interactions at Mt Cameroon, West Africa

2011

View full text Add to dashboard Cite

The Mt Cameroon volcano is the highest and most active volcano of the Cameroon Volcanic Line. Little geological information is available for improving the understanding of the structure of this large volcanic system and its relationship to regional tectonics. After reviewing the tectonic evolution of the region, the analysis of a Digital Elevation Model and results from a field campaign dedicated to mapping geological structures in the summit area and at the SE base of Mt Cameroon are presented. Mt Cameroon is a lava-dominated volcano with long steep (over 30°) flanks. It is elongate parallel to its well defined rift zone. The summit plateau is bordered by 10 m high cliffs formed by summit subsidence along normal faults. Geological profiles were measured along rivers cutting through a topographic step at the SE base of Mt Cameroon.This step is associated with deformed Miocene sediments from the Douala basin that are overlain by volcanic products. Weak sediments of this area are deformed by 050°-060°and 020°-030°trending asymmetrical folds verging toward the SE, and thrusts faults related to the spreading of the volcano over its mechanically weak substratum. Combined remote sensing and field observations suggest that spreading is accommodated by summit subsidence and flanks sliding. Both slow spreading movements and catastrophic collapses of the steep flanks are interpreted to result from complex interactions between the growing edifice, repeated dyke intrusions, the weak sedimentary substratum and tectonic structures.

show abstract

Section: Introductionmentioning

confidence: 98%

Field evidence for flank instability, basal spreading and volcano-tectonic interactions at Mt Cameroon, West Africa

2011

View full text Add to dashboard Cite

show abstract

“…For these tasks, a large number of methods have been proposed such as a statistical method using Weibull analysis and a non-homogeneous generalized Pareto-Poisson process [83], a mixture of exponentials distributions [84], a Bayesian event tree to estimate volcanic hazard (BET VH) [85][86][87], a Bayesian event tree for eruption forecasting [88], the extreme value theory [89] A detailed description of GIS and their application to natural hazards is presented by Tarolli and Cavalli [101]. Such analysis of data has allowed addressing many applications such as analysis of lava ows [95], discrimination of volcanic ashes according to textures [102], ranking of volcanic threats [103], zonation of volcanic hazards [104], zonation of lava ow [105], analysis of sensitivity to lahar hazards for variations in exposed population [106], forecast of style and size of eruptions [82], pattern recognition of volcanic tremor data [107], management of volcanic crises [108], modelling of volcanic source [90], location of incipient volcanic vents [75], characterization of thermal volcanic activities [91], land-use and contingency planning as risk mitigation strategies [80], and development of volcanic alert systems [109].…”

Section: Volcanic Eruptionsmentioning

confidence: 99%

Current Efforts for Prediction and Assessment of Natural Disasters: Earthquakes, Tsunamis, Volcanic eruptions, Hurricanes, Tornados, and Floods

2017

View full text Add to dashboard Cite

Abstract. This article presents a state-of-the-art review of di erent methods, signal and image processing techniques, and statistical analyses used for prediction and assessment of natural disasters including earthquakes, tsunamis, volcanic eruptions, hurricanes, tornadoes, and oods. Application of the big data paradigm to the aforementioned natural disasters is also discussed. The research for increasingly more sophisticated computational models will continue to achieve more accurate predictions of various natural disasters.

show abstract

“…Basaltic lava flows occur predominantly along the NE and SW flanks of the volcano. These lava flows are relatively mobile, reaching lengths of up to 9 km (Bonne et al 2008;Favalli et al 2011;Njome et al 2008;Wantim et al 2013a, b), and thus pose a potential threat to communities at the base of the volcano. Favalli et al (2011) and Wantim et al (2013b) developed idealised lava flow models to be used as a base to alert and potentially evacuate communities at risk of advancing lava flows.…”

Section: Mount Cameroon: General Setting and Types Of Natural Hazardsmentioning

confidence: 99%

“…Donovan et al (2014) suggest that Mount Cameroon is considered as a low risk potential, due to the predominantly effusive nature of its eruptions, but with an extremely high likelihood of an eruption in the next 30 years. A number of volcanic hazard and risk assessments have been performed (Bonne et al 2008;Thierry et al 2008;Favalli et al 2011;Gehl et al 2013) but these have largely been limited to scientific publications. Translation of relevant scientific information into understandable language for the local population is yet to be fully implemented in the area, and will facilitate the delivery of more efficient assistance in preparedness and response to natural hazards (e.g.…”

Section: Project Motivationmentioning

confidence: 99%

Investigating the Management of Geological Hazards and Risks in the Mt Cameroon Area Using Focus Group Discussions

Marmol

Fontijn

Atanga

et al. 2017

Advances in Volcanology

View full text Add to dashboard Cite

The scientific evaluation of hazards and risks remains a primary concern in poorly known volcanic regions. The use of such information to develop an effective risk management structure and risk reduction actions however also poses important challenges. We here present the results of a series of focus group discussions (FGDs) organised with city councillors from three municipalities around Mt Cameroon volcano, Cameroon. The Mt Cameroon area is a volcanically and tectonically active region regularly affected in the historical past by lava flows, landslides and earthquake swarms, and has a potential for crater lake outgassing. The lower flanks of the volcano are densely populated and the site of intense economic development. The FGDs were aimed at the elicitation of (1) the knowledge and perception of geological hazards, (2) the state of preparedness and the implementation of mitigation and prevention actions by the municipalities, (3) the evaluation of the effectiveness of the structure of communication channels established to respond to emergency situations, and (4) the recovery from an emergency. In all three municipalities stakeholders had good knowledge of the risks, except for processes never experienced in the region. They generally grasped the causes of landslides or floods but were less familiar with volcano-tectonic processes. Stakeholders identified the lack of strategic planning to monitor hazards and mitigate their impacts as a major weakness, requesting additional education and scientific support. Response to natural hazards is mostly based on informal communication channels and is supported by a high level of trust between local scientists, decision makers and the population. Actions are taken to raise awareness and implement basic mitigation and prevention actions, based on the willingness of local political leaders. The strong centralisation of the risk management process at the national level and the lack of political and financial means at the local level are major limitations in the implementation of an effective risk management strategy adapted to local risk conditions. Our case study highlights the need for earth and social scientists to actively work together with national and local authorities to translate the findings of scientific hazard and risk assessment into improved risk management practices.

show abstract

A new approach to assess long‐term lava flow hazard and risk using GIS and low‐cost remote sensing: the case of Mount Cameroon, West Africa

Cited by 43 publications

References 40 publications

Field evidence for flank instability, basal spreading and volcano-tectonic interactions at Mt Cameroon, West Africa

Field evidence for flank instability, basal spreading and volcano-tectonic interactions at Mt Cameroon, West Africa

Current Efforts for Prediction and Assessment of Natural Disasters: Earthquakes, Tsunamis, Volcanic eruptions, Hurricanes, Tornados, and Floods

Investigating the Management of Geological Hazards and Risks in the Mt Cameroon Area Using Focus Group Discussions

Contact Info

Product

Resources

About