The June 27, 2001 landslide on volcanic cones in Limbe, Mount Cameroon, West Africa

Ayonghe, Samuel N.; Ntasin, EB; Samalang, P.; Suh, Cheo Emmanuel

doi:10.1016/j.jafrearsci.2004.07.022

Cited by 54 publications

(62 citation statements)

References 10 publications

(10 reference statements)

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“…200,000 inhabitants) is located to the NE, too far to be directly impacted by an eruption but is downhill and downstream of a crater lake with the potential to outgas, and which provides the main water supply to the town; it is also prone to landslides and earthquakes; (3) Limbe (ca. 95,000 inhabitants; invited participants from Limbe 1 council) is located near the SE coast with a high risk of lava flow invasion (Favalli et al 2011) and has experienced multiple flooding and landslide events in recent decades (Ayonghe et al 2004;Che et al 2011). The risk imposed by floods and landslides is enhanced by unregulated building practices (Che et al 2012b).…”

Section: Focus Group Discussionmentioning

confidence: 99%

“…However, because most of these landslides have not caused fatalities in the past, they are not always recorded or reported (Ayonghe et al 2004;Diko 2012). Floods (Ndille and Belle 2014), crater lake outgassing and different types of earthquakes are other natural hazards that characterise the Cameroon Volcanic Line.…”

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

confidence: 99%

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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

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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.

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Section: Focus Group Discussionmentioning

confidence: 99%

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

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

show abstract

“…Landslides impact areas with slopes of more than 35 ∘ (see Fig. 5b and 7, 35-80 ∘ according to [62]) while floods are the most widespread hazard in the plain and affects all localities when it does occur [65]. This is true in all rainy tropical volcanic (active or extinct) regions with contrasting relief, i.e.…”

Section: Causes Of the Geohazards And Mappingmentioning

confidence: 99%

“…[30] point out the increase of human risks in CVL as evidenced by the loss of about 30 lives within the last 20 years because of numerous landslides in the Limbe area on the foot slope of Mount Cameroon. Twenty-four people died during the 2001 Limbe landslide (2800 people homeless) and five others during the 2003 Bambouto-Magha landslide [13,62].…”

Section: Causes Of the Geohazards And Mappingmentioning

confidence: 99%

Geohazards (floods and landslides) in the Ndop plain, Cameroon volcanic line

et al. 2016

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Abstract:The Ndop Plain, located along the Cameroon Volcanic Line (CVL), is a volcano-tectonic plain, formed by a series of tectonic movements, volcanic eruptions and sedimentation phases. Floods (annually) and landslides (occasionally) occur with devastating environmental effects. However, this plain attracts a lot of inhabitants owing to its fertile alluvial soils. With demographic explosion in the plain, the inhabitants (143,000 people) tend to farm and inhabit new zones which are prone to these geohazards. In this paper, we use field observations, laboratory analyses, satellite imagery and complementary methods using appropriate software to establish hazard (flood and landslide) maps of the Ndop Plain. Natural factors as well as anthropogenic factors are considered. The hazard maps revealed that 25% of the area is exposed to flood hazard (13% exposed to high flood hazard, 12% to moderate) and 5% of the area is exposed to landslide hazard (2% exposed to high landslide hazard, 3% to moderate). Some mitigation measures for floods (building of artificial levees, raising foundations of buildings and the meticulous regulation of the flood guards at Bamendjing Dam) and landslides (slope terracing, planting of trees, and building retaining walls) are proposed.

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“…For example, lahars and mudflows may not only occur during volcanic unrest, but also may be triggered by heavy rains, months after the eruption, as at Pinatubo in 2001(Hayes et al, 2002 and more recently at Merapi volcano in 2010 (Lavigne et al, 2011;Bignami et al, 2013). On Mount Cameroon, landslides that are not related to contemporary volcanic activity are a major concern (Ayonghe et al, 2004). On Etna and Stromboli, several zones are affected by landslides at various scales, triggered by vol- canic activities and/or by seismicity (Acocella et al, 2006b;Solaro et al, 2010;Barreca et al, 2013).…”

Section: Hazardmentioning

confidence: 99%

A method for multi-hazard mapping in poorly known volcanic areas: an example from Kanlaon (Philippines)

Neri

Cozannet

Thierry

et al. 2013

Nat. Hazards Earth Syst. Sci.

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Hazard mapping in poorly known volcanic areas is complex since much evidence of volcanic and non-volcanic hazards is often hidden by vegetation and alteration. In this paper, we propose a semi-quantitative method based on hazard event tree and multi-hazard map constructions developed in the frame of the FP7 MIAVITA project. We applied this method to the Kanlaon volcano (Philippines), which is characterized by poor geologic and historical records. We combine updated geological (long-term) and historical (short-term) data, building an event tree for the main types of hazardous events at Kanlaon and their potential frequencies. We then propose an updated multi-hazard map for Kanlaon, which may serve as a working base map in the case of future unrest. The obtained results extend the information already contained in previous volcanic hazard maps of Kanlaon, highlighting (i) an extensive, potentially active ~5 km long summit area striking north–south, (ii) new morphological features on the eastern flank of the volcano, prone to receiving volcanic products expanding from the summit, and (iii) important riverbeds that may potentially accumulate devastating mudflows. This preliminary study constitutes a basis that may help local civil defence authorities in making more informed land use planning decisions and in anticipating future risk/hazards at Kanlaon. This multi-hazard mapping method may also be applied to other poorly known active volcanoes

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The June 27, 2001 landslide on volcanic cones in Limbe, Mount Cameroon, West Africa

Cited by 54 publications

References 10 publications

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

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

Geohazards (floods and landslides) in the Ndop plain, Cameroon volcanic line

A method for multi-hazard mapping in poorly known volcanic areas: an example from Kanlaon (Philippines)

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