Assessment of relative active tectonics in Edea – Eseka region (SW Cameroon, Central Africa)

Ngapna, Moussa Nsangou; Owona, Sébastien; Owono, François Mvondo; Ateba, Christian Balla; Tsimi, Véronique Manga; Ondoa, Joseph Mvondo; Ekodeck, Georges Emmanuel

doi:10.1016/j.jafrearsci.2020.103798

Cited by 14 publications

(3 citation statements)

References 101 publications

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“…In the study area, the SL index was calculated at five points for the main waterway where the slope of the profile changes (Figure 2), the largest value of which represents the SL index of the river (Table 5). Based on the results of the SL index calculation, the study area is in an inactive tectonic class [21]. River sinuosity index (Sr): The higher the Sr index, the closer the river to equilibrium and hence the lower the rate of tectonic activity in the area [22].…”

Section: Resultsmentioning

confidence: 99%

“…based on this index and the presence of many twists and turns in the river indicates the basin's equilibrium (absence of tectonic activity) and its straight path indicates the youth of the region and high tectonic activity [12]. C The length of the river or the flow along the river along with its twists and turns from the beginning of the river in SARAB to the outlet point in meters.…”

Section: A the Sinuosity Of The River (Sr)mentioning

confidence: 99%

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Calculated the Tectonic Activity of Catchments in the SAQEZ Geomorphology Unit (Iran and Kurdistan) Using Morphometric Indices

Arefpanah¹,

Sharafi²

2022

JoCEF

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Landslides are tectonic and morphological indicators. The Morphotectonics Index is a suitable tool for probability estimation and earthquake planning in the region. Landslides are the most common natural threat in Iran. A sustainable management plan requires landslide hazard zoning planning. Therefore, the estimation of landslide risk in selected areas using the morphological index is the purpose of this study. Rivers are very sensitive to tectonic movements, and river landforms are closely radiated to tectonic movements. The Deformation Tectonic Index was used as a tool to identify new and active structures for these movements. The SAQEZ River Basin is located in the northwest of the country according to its characteristics. Its landform has a high flood capacity and a moderate slope of about 33.01%, resulting in severe erosion and flooding in the area. The purpose of this study was to analyze tectonic activity in the SAQEZ River Basin using remote sensing software and topographic maps and digital elevation models in a GIS environment. In this study, four morphological and structural indices, including river length gradient index (SL), basin shape index (BS), river tortuosity index (Sr), and basin asymmetry factor (Af), were used, and their results were analyzed. An analysis is expressed as the Active Tectonic Index (IAT). According to the survey results, the values of the SL, BS, Sr, and Af indices were 207, 1.09, 1.27, and 66, respectively. The Active Tectonic Index (IAT) shows moderate tectonic activity in the area.

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Section: Resultsmentioning

confidence: 99%

Section: A the Sinuosity Of The River (Sr)mentioning

confidence: 99%

Calculated the Tectonic Activity of Catchments in the SAQEZ Geomorphology Unit (Iran and Kurdistan) Using Morphometric Indices

Arefpanah¹,

Sharafi²

2022

JoCEF

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“…The basic geomorphological principle of "differential erosion" [19][20][21][22][23][24][25] says something different than the paragraph above. This principle was a milestone in the conception of drainage pattern development, especially in mountainous areas of the Earth, e.g., in the Outer Carpathian Mts (OC)-the headwater of the largest river in our study.…”

Section: Introductionmentioning

confidence: 99%

Rivers Try Harder. Reversed “Differential Erosion” as Geological Control of Flood in the Large Fluvial Systems in Poland

Bihałowicz

Wierzbicki

2021

Water

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We study cross-sections on the Detailed Geological Map of Poland (SMGP) to find a geologic and geomorphic pattern under river valleys in Poland. The pattern was found in 20 reaches of the largest Polish rivers (Odra, Warta, Vistula, Narew, and Bug) located in the European Lowland, in the landscape of old (Pleistocene, Saalian) glacial high plains extending between the Last Glacial Maximum (LGM) moraines on the North and the Upland on the South. The Upland was slightly folded and up-faulted during Alpine orogeny together with the thrust of Carpathian nappes and the uplift of Tatra Mts. and Sudetes. The found pattern is an alluvial river with broad Holocene floodplain and the channel developed atop the protrusion of bedrock (Jurassic, Cretaceous limestones, marlstones, sandstones) or non-alluvial, cohesive, overconsolidated sediments resistant to erosion (glacial tills, lacustrine or “ice-dammed lake” clays) of Cenozoic (Paleogene, Neogene, Quaternary—Elsterian). We regard the sub-alluvial protrusion as the limit of river incision and scour. It cannot be determined why the river flows atop these protrusions, in opposition to “differential erosion”, a geomorphology principle. We assume it is evidence of geological flood control. We propose an environmental and geomorphological framework for the hydrotechnical design of instream river training.

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The Western Cameroon Highland margin: Is there any geomorphometric evidence of active tectonics?

et al. 2022

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The Western Cameroon Highland margin (WCHM) within the West African margin displays an uneven high relief. Its evolutionary model in vogue suggests the tectonic activity of the Cameroon Volcanic Line (CVL). An evident question in this regard is whether there is any geomorphometric evidence in support of what is this widespread view? We evaluate this question using field controls and geomorphometric indices of active tectonics derived for 13 main river basins with the help of digital elevation model (DEM)‐30 m data. The WCHM is developed on Proterozoic granite‐gneissic basement and the Cretaceous to Recent volcano‐sedimentary cover and was affected by regional active tectonic features. It is marked by transient signs of different landscape evolutionary stages recorded by the relief and drainage network; shown by gradual adjustment of rivers to equilibrium stages; and cautioned by a greatest variation of DEM‐based geomorphic indices. These indices, hypsometric integral (HI = 0.10–0.35), topography relief (TR = 595–2,710), topography dissection (TD = 114–829), valley floor width to valley height ratio (Vf arg = 0.61–14.91), transverse topographic symmetric factor (T‐index = 0.18–0.49), and basin asymmetric factor (AF = 1.08–24.37) highlight elevated and roughness character of that margin, from the Benue Trough and culminating to the CVL. River longitudinal profiles reveal variably and deeply incised WCHM by the drainage network, reinforced by ongoing tectonic activities. Knickpoints (Kps), stream length‐gradient (SL), uplift (U = 1.17–2.0), and a variety of normalized steepness (Ksn = 11.63–635.16) evidence the diversity and preeminent tectonic controls. The above results show that the WCHM is widely considered to be the consequence of the mantle dynamisms and regional tectonics since Proterozoic, the CVL activities, and the erosional processes.

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Assessment of relative active tectonics in Edea – Eseka region (SW Cameroon, Central Africa)

Cited by 14 publications

References 101 publications

Calculated the Tectonic Activity of Catchments in the SAQEZ Geomorphology Unit (Iran and Kurdistan) Using Morphometric Indices

Calculated the Tectonic Activity of Catchments in the SAQEZ Geomorphology Unit (Iran and Kurdistan) Using Morphometric Indices

Rivers Try Harder. Reversed “Differential Erosion” as Geological Control of Flood in the Large Fluvial Systems in Poland

The Western Cameroon Highland margin: Is there any geomorphometric evidence of active tectonics?

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