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WITHDRAWN Reassessing Tectono-structural Units and Crustal Thickness Variations in Southwest Cameroon Using Gravity and Seismic Data

Description: 

WITHDRAWN Southwest Cameroon is characterized by inadequately detailed geological data, prompting an investigation into its geological and tectonic features through innovative edge detection techniques applied to gravity data. This study employs methods such as the Analytical Signal (AS), Tilt Angle (TDR), Total Horizontal Gradient of the Tilt Angle (TDR_THDR), and Logistic Filter (IL) to delineate lineaments and geological contacts from derived gravity anomaly maps. A key contribution is the identification of significant tectonic boundaries, including the Kribi-Campo faults and the Ebolowa pseudo-karstic circular network. This represents the first comprehensive mapping of the Ebolowa network, integrating links to the Mbilibekon and Mfuda caves, thereby enhancing our understanding of the region's pseudo-karstic landscape and geological evolution.Moreover, the detailed delineation of the north-south extension of the Kribi-Campo faults, extending into both oceanic and terrestrial domains, aligns with the geophysical mapping of the eastern Congo Craton margin. This underscores the fault system's role as a transition zone between stable cratonic cores and dynamic mobile belts, suggesting a reevaluation of regional tectonic models. To enhance the interpretation of edge detection results, we estimated Moho depths by combining gravity and seismic data. The average Moho depth of 46 km, with maximum depths reaching 48 km, correlates with regions exhibiting pronounced faulting and sedimentary features. Intermediate Moho depths (40-42 km) near Akom II, Eséka, and Lolodorf indicate thrusting contacts between the Pan-African Yaoundé nappe and the Paleoproterozoic Nyong Complex, validating the tectonic structures identified by edge detection techniques. Our findings enhance understanding of the subsurface structural features of Southwestern Cameroon while also offering a robust foundation for future geological and geophysical research in the region, emphasizing the critical link between surface and subsurface geological processes.

Session: Earthquakes, Lithospheric Structure, and Dynamics in Stable Continental Region [Poster]

Type: Poster

Date: 4/17/2025

Presentation Time: 08:00 AM (local time)

Presenting Author: Kwega Ghomsi

Student Presenter: Yes

Invited Presentation: 

Poster Number: 72

Authors