Crustal structure beneath Cameroon from EGM2008

Evariste, Ngatchou Heutchi; Liu, Genyou; Tabod, Tabod Charles; Kamguia, Joseph; Nguiya, Séverin; Alain, Tiedeu; Ke, Xiaoping

doi:10.3724/sp.j.1246.2014.01001

Cited by 32 publications

(13 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this work, we use EGM2008 to reinforce the possibilities of applying this potential field model in regional mapping. Such works have previously been conducted by [9]- [13]. This proves its efficiency.…”

Section: Introductionsupporting

confidence: 56%

Structure of the Crust Beneath the South Western Cameroon, from Gravity Data Analysis

Jean¹,

Abate²,

Nouck³

et al. 2016

IJG

View full text Add to dashboard Cite

The study area is located in the south western Cameroon and includes part of the Cameroon Volcanic Line (CVL). Volcanic activity has been recorded in this area, precisely on the Mount Cameroon which recently erupted in 2002. In addition, deadly carbonic gas was emitted by crater lakes (Monoun and Nyos) in 1984 and 1986 respectively. Potential field model EGM2008 has been used to investigate the structure of the crust. A regional/residual separation is performed using upward continuation and polynomial separation methods. The results from this operation show a similarity between the regional anomalies resulting from both methods. The regional anomaly maps present an increasing gradient trending ENE-WSW above and below latitude 5˚N. Moreover, six nearly parallel profiles were drawn on the CVL in addition to two other profiles at the northern edge of Congo craton. These profiles were used to estimate the depths of the Moho discontinuity and some shallow sources by the means of the Bouguer and the residual anomalies respectively. The results show that the Moho discontinuity depths vary from 19-25 km (under Mount Cameroon) to 28-34 km (in Kumbo), while the southern neighbouring zone presents a Moho discontinuity depth ranging between 23-31 km (in Ngambe) and 22-32 km (in Eseka). These findings agree with the previous seismic and gravity researches lead in the area. EGM2008 is therefore a reliable tool to investigate the subsurface structures.

show abstract

Section: Introductionsupporting

confidence: 56%

Structure of the Crust Beneath the South Western Cameroon, from Gravity Data Analysis

Jean¹,

Abate²,

Nouck³

et al. 2016

IJG

View full text Add to dashboard Cite

show abstract

“…Unlike terrestrial gravity data, satellite gravity data are available in areas difficult to reach and could solve poor resolution and sparseness of terrestrial gravity data. Some researchers have validated this gravity database by comparing the results of their studies with those obtained from other sources of geophysical data [23][24][25][26]. These authors have suggested that gravity data derived from the EGM2008 model can fill the lack of terrestrial gravity data in some areas.…”

Section: Satellite Gravity Data (Egm2008)mentioning

confidence: 99%

Combination of Terrestrial and Satellite Gravity Data for the Characterization of the Southwestern Coastal Region of Cameroon: Appraisal for Hydrocarbon Exploration

Kamto

Lemotio

Tokam

et al. 2021

International Journal of Geophysics

View full text Add to dashboard Cite

The southwestern coastal region of Cameroon is an area of interest because of its hydrocarbon potential (gas and oil). Terrestrial and satellite gravity data were combined and analyzed to provide a better precision in determining the structure of the study area. Firstly, the two gravity databases (in situ and satellite) have been coupled and validated using the least square collocation technique. Then, spectral analysis was applied to the combined Bouguer anomaly map to evaluate the thickness of sediments in some localities. We found that the sedimentary cover of the southwestern coastal region of Cameroon has a thickness that varies laterally from 1.68 ± 0.08 to 2.95 ± 0.15 km , especially in the western part. This result confirms that our target area is a potential site for hydrocarbon exploration. The horizontal gradient method coupled with the upward continuation at variable heights has been used to highlight several lineaments and their directions (N-S, E-W, SW-NE, and SSW-NNE). Lineaments trending in an N-S orientation are predominant. The Euler deconvolution method was also applied to the Bouguer anomaly map to determine the position, orientation, and depth of the different superficial faults of the study area. It appears that the majority of superficial faults have an N-S and SSW-NNE orientation. These directions are correlated with those previously highlighted by the maxima of horizontal gradient. The structural map could be used for a better identification of the direction of fluid flow within the subsurface or to update the geological map of our study area.

show abstract

“…Due to dense buildings and municipal facilities on ground, these methods might also be inconvenient in urban area. As an alternative method, gravity is a good tool for inferring subsurface structures (Sultan et al, 2012;Tigli et al, 2012;Saleh and Saleh, 2012;Wang et al, 2012;Evariste et al, 2014), because gravity implies density distribution inside the earth and can subsequently be used to invert tectonic stress.…”

Section: Introductionmentioning

confidence: 98%

Multilayer stress from gravity and its tectonic implications in urban active fault zone: A case study in Shenzhen, South China

Wang

Luo

et al. 2015

Journal of Applied Geophysics

View full text Add to dashboard Cite

It is significant to identify urban active faults for human life and social sustainable development. The ordinary methods to detect active faults, such as geological survey, artificial seismic exploration, and electromagnetic exploration, are not convenient to be carried out in urban area with dense buildings. It is also difficult to supply information about vertical extension of the deeper faults by these methods. Gravity, reflecting the mass distribution of the Earth's interior, provides an alternative way to detect faults, which is more efficient and convenient for urban active fault detection than the aforementioned techniques. Based on the multi-scale decomposition of gravity anomalies, a novel method to invert multilayer horizontal tectonic stresses is proposed. The inverted multilayer stress fields are further used to infer the distribution and stability of the main faults. In order to validate our method, the multilayer stress fields in the Shenzhen fault zone are calculated as a case study. The calculated stress fields show that their distribution is controlled significantly by the strike of the main faults and can be used to derive depths of the faults. The main faults in Shenzhen may range from 4 km to 20 km in the depth. Each layer of the crust is nearly equipressure since the horizontal tectonic stress has small amplitude. It indicates that the main faults in Shenzhen are relatively stable and have no serious impact on planning and construction of the city.

show abstract

Crustal structure beneath Cameroon from EGM2008

Cited by 32 publications

References 19 publications

Structure of the Crust Beneath the South Western Cameroon, from Gravity Data Analysis

Structure of the Crust Beneath the South Western Cameroon, from Gravity Data Analysis

Combination of Terrestrial and Satellite Gravity Data for the Characterization of the Southwestern Coastal Region of Cameroon: Appraisal for Hydrocarbon Exploration

Multilayer stress from gravity and its tectonic implications in urban active fault zone: A case study in Shenzhen, South China

Contact Info

Product

Resources

About