Mapping and Assessment of Volcanic Hazards Related to the Ignimbritic Eruption by AMS in Bambouto Volcano (Cameroon Volcanic Line)

Dedzo, Merlin Gountié; Kamgang, Pierre; Njonfang, Emmanuel; Tefogoum, Ghislain Zangmo; Dongmo, Armand Kagou; Nkouathio, D. G.

doi:10.2174/1874262901307010001

Cited by 11 publications

(6 citation statements)

References 29 publications

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“…Gountié Dedzo et al; JGEESI, 24(2): 39-60, 2020; Article no.JGEESI.55452 40 These deposits covering approximately 27% (≈195 km 2 ) of the volcanoes surface with thickness ranging from 30 to 200 m representing a total volume estimated at 20 km 3 . Because of the intense weathering of the ignimbritic formations after their setting up and being buried by basaltic and trachtytic flows, the initial volume of these pyroclastic deposits is really much larger.…”

Section: Original Research Articlementioning

confidence: 99%

“…According to the data acquired from the AMS technique and the field studies of pyroclastic deposits in the volcano's craters and on their respective slopes, the former flows have been mapped. It emerges that the steepest slopes of the volcanoes controlled the flow of the pyroclastic materials [73]. Vulnerability map (Fig.…”

Section: Mappingmentioning

confidence: 99%

“…

Original Research ArticleGountié Dedzo et al; JGEESI, 24(2): 39-60, 2020; Article no.JGEESI.55452 40 These deposits covering approximately 27% (≈195 km 2 ) of the volcanoes surface with thickness ranging from 30 to 200 m representing a total volume estimated at 20 km 3 . Because of the intense weathering of the ignimbritic formations after their setting up and being buried by basaltic and trachtytic flows, the initial volume of these pyroclastic deposits is really much larger.

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Mapping of Pyroclastic Density Currents Hazards and Assessment of Related Risks by AMS Technique in the West-Cameroon Highlands: Case of Bambouto and Bamenda Volcanoes

Dedzo

Tefogoum

Tchamabé

et al. 2020

JGEESI

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Ignimbritic flow deposits which derived from pyroclastic density currents (PDCs) are mostly observed in West-Cameroon Highlands located in the central portion of the Cameroon Volcanic Line (CVL), especially in Bambouto (21.12 -0.50 Ma) and Bamenda (27.40 -0 Ma) volcanoes. Original Research ArticleGountié Dedzo et al.; JGEESI, 24(2): 39-60, 2020; Article no.JGEESI.55452 40 These deposits covering approximately 27% (≈195 km 2 ) of the volcanoes surface with thickness ranging from 30 to 200 m representing a total volume estimated at 20 km 3 . Because of the intense weathering of the ignimbritic formations after their setting up and being buried by basaltic and trachtytic flows, the initial volume of these pyroclastic deposits is really much larger. Soil fertility has fostered an important population growth (more than 1,200,000 people) in these volcanoes. The economic and agropastoral activities on the flanks and inside the caldera of the volcanoes are estimated at about $US7.5 billion. In this paper, we evaluate and realize cartography of the hazards associated to ignimbritic eruptions which are most disastrous in term of volcanic process in this region. Magnetic studies, specifically, Anisotropy of Magnetic Susceptibility (AMS) method has been utilized for the determination of flow directions in visually nearly isotropic ignimbritic deposits outcrops. The AMS data reported from the Bamenda and Bambouto volcanoes ignimbrites produced significant informations about the depositional scheme of the PDCs. In most sites, magnetic lineations and principally magnetic foliation are reliably parallel to downhill directions, frequently with an upslope imbrication. Inferred palaeoflow directions based on the field indicators, orientation of minerals and other objects in oriented thin sections and the directional AMS data show that Bambouto caldera, Oku crater and Santa-Mbu caldera are the sources of main PDCs of Bambouto and Bamenda volcanoes. These AMS results have aided us to produce a hazard and risks maps related to potential future pyroclastic flows on these volcanoes. The assessment of risks in these volcanoes was based on populations in the study area, infrastructures (houses and roads) and average income of breeding activity.

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Section: Original Research Articlementioning

confidence: 99%

Section: Mappingmentioning

confidence: 99%

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Mapping of Pyroclastic Density Currents Hazards and Assessment of Related Risks by AMS Technique in the West-Cameroon Highlands: Case of Bambouto and Bamenda Volcanoes

Dedzo

Tefogoum

Tchamabé

et al. 2020

JGEESI

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“…It has two main volcanoes at Bambili and Lefo (Santa) areas which culminates at altitudes of 2621 and 2545 m a.s.l respectively. It is also characterized by two calderas; the Santa-Mbu and Lefo calderas [29]. It relief is highly accidental owing to the diversity of volcanic manifestations and products in the area.…”

Section: Study Area Profilementioning

confidence: 99%

Landslide Susceptibility Mapping and Risk Assessment on the Bamenda Mountain (Cameroon Volcanic Line)

S¹,

Dongmo²,

Wotchoko³

et al. 2017

JGG

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The Bamenda Mountain (with over 250,000 inhabitants) is one of the strato-volcanoes along the Cameroon Volcanic Line (CVL) with an accidental landscape. This area is frequently affected by landslides, which most at times result in destruction of property and loss of lives. An informative value statistical method using GIS is use to prepared a landslide susceptibility map for the Bamenda Mountain area as well as a quantitative and qualitative risk assessment. This is aimed at revealing areas where future landslide would occur and potential loss. Nine landslide controlling factors including; slope, slope orientation (aspect), curvature, stream density, proximity to roads, geomorphology, proximity to streams, geology and land use were use in the model. A total of 64 slides were inventoried in the area and use to prepare the landslide density map. The weighted informative values for the combined factor and landslide density were used to prepare the landslide susceptibility map for the area. The most significant landslide causing factors in this area are; slope, stream density and slope aspect. The susceptibility map was classified into very high (17.8%), high (25.9%), moderate (33.6%) and low (22.7%). The validated model using the success rate curve indicates that the area under curve is 0.823 and predicts landslides at 82.3% in relatively high classes. Landslide risk assessment in the area indicates 406 buildings, 2,436 people, 1,291.1km of roads, 2152 ha of farmland and an approximate USD83,540,000 worth in assets are expose to high and very high risk. This approach can be implemented in other areas along the CVL to map and assess landslide risk.

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“…Mount Bambouto, which was once a very active volcano, was truncated at their summit by a caldera like some volcanoes along the Cameroon Volcanic Line (Figure 1). It caldera was chosen for the present study because Mount Bambouto have been the subject of numerous studies focusing mainly on petrography, geochemistry, geochronology, geo-heritage, hazards and associated risks [18][19][20][21][22][23][24][25][26][27][28][29].…”

Section: Introduction and Geological Contextmentioning

confidence: 99%

The Caldera of Mount Bambouto: Volcanological Characterization and Classification

Tefogoum¹,

Nkouathio²,

Dongmo³

et al. 2021

Updates in Volcanology - Transdisciplinary Nature of Volcano Science

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Mount Bambouto culminates at 2744 m (Meletan Mountain) where an elliptical caldera of 16 × 8 km is found. Although that caldera has been a subject of numerous scientific works, complementary studies were needed to bring out additional data used to classify it through the Caldera DataBase of Geyer and Marti (2008). It emerges that Bambouto Caldera codes are 2 and 203 because it is respectively located in Africa and Central Africa according to the numbering system developed in the Catalog of Active Volcanoes of the World. The collapse type of the caldera is piecemeal; this relies on the fact that the caldera floor is uneven. Several rocks crop out in the caldera; accordingly, its code is B, I, T, P, and Ig viz. basalts, intermediate rocks, trachytes, phonolites, and ignimbrites. Bambouto depression is the ignimbrite caldera because it is associated with thick ignimbrite sheer, that ruled its collapse. The chemical analysis of rocks reveals that the magmatic series of Bambouto Caldera is of alkaline type. It has been built through the continental rifting of extensional type (RC-EXT). The collapse process has been followed by post-caldera protrusion of trachytic and phonolitic domes; then, its codes are TypeS and type-MS.

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Mapping and Assessment of Volcanic Hazards Related to the Ignimbritic Eruption by AMS in Bambouto Volcano (Cameroon Volcanic Line)

Cited by 11 publications

References 29 publications

Mapping of Pyroclastic Density Currents Hazards and Assessment of Related Risks by AMS Technique in the West-Cameroon Highlands: Case of Bambouto and Bamenda Volcanoes

Mapping of Pyroclastic Density Currents Hazards and Assessment of Related Risks by AMS Technique in the West-Cameroon Highlands: Case of Bambouto and Bamenda Volcanoes

Landslide Susceptibility Mapping and Risk Assessment on the Bamenda Mountain (Cameroon Volcanic Line)

The Caldera of Mount Bambouto: Volcanological Characterization and Classification

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