The complexities of assessing volcanic hazards along the Cameroon Volcanic Line using spatial distribution of monogenetic volcanoes

Schmidt, Christoph; Laag, Christian; Whitehead, Melody; Profe, Jörn; Aka, Festus Tongwa; Hasegawa, Takeshi; Keresztúri, Gábor

doi:10.1016/j.jvolgeores.2022.107558

Cited by 7 publications

(1 citation statement)

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“…The highlands of Cameroon form the androgenic plutonic complexes of the CVL and encompass a succession of volcanoes oriented at 30˚E with peaks ranging from 900 to 1,800 m for the smallest to 3,010 m for Mount Oku and 4,020-4,100 m for Mount Cameroon, located near the coastal plain (Deruelle et al, 2007;Beckline et al, 2018;Wembenyui et al, 2020). The CVL consists of eight monogenetic volcanic fields with an estimated total area of 17,000 km 2 , with individual fields ranging in size from 700-4,000 km 2 (Schmidt et al, 2022). Because the CVL is located in a unique tectonic environment at the transition from the oceanic to continental crust, it serves as a natural laboratory for the study of the geochemical evolution of alkaline magmas with varying degrees of crustal contamination and mixing.…”

Section: Geological Settingmentioning

confidence: 99%

Contribution of advanced edge-detection methods of potential field data in the tectono-structural study of the southwestern part of Cameroon

et al. 2022

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The southwest part of Cameroon is composed of a range of geological structures and sedimentary basins, whose geological history dates from the Cretaceous, and their establishment would have originated from the opening of the South Atlantic. Among these structures, the most important is the Cameroon Volcanic Line, generally denoted CVL, followed by the southern part of the Central African Shear Zone (CASZ) called the Foumban Shear Zone (FSZ), the Ntem Complex, the Benue Trough, the northern margin of the Congo Craton, and many others. The major structures identified in this part are formed as a result of geodynamic activity between the Oligocene and the recent period, to which we can add the volcanism that exists along with the continental limit. The XGM201e_2159 model is used to highlight the geological structures of Southwestern Cameroon. First, we separated the regional and residual anomalies from Bouguer gravity data. Then, we used a combination of filters to enhance the signature of the residual anomalies in Southwest Cameroon. These filters identified various geological structures in the area. Finally, we applied the enhanced horizontal gradient amplitude (EHGA) and multi-scale horizontal derivative of the vertical derivative (MSHDVD) methods to reveal the geological contacts, allowing us to establish the corresponding structural map of the region. In addition, the results obtained in this study are the first to precisely define the circumferential demarcation of the continental and oceanic expansions of Mount Cameroon, while clearly illustrating the Bao, Bomana, Tiko, and Ekona faults that extend to the Bakassi Peninsula and the Douala outlet. Furthermore, they highlight the strike–slip faults in the summit vicinity. The structural map shows that most of the geological boundaries identified in the area are trending in the NE–SW, NNE–SSW, ENE–WSW, N–S, and NW–SE directions.

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