Aeromagnetic characterization of structural features influencing fissured aquifers in the Lobo catchment area, Nibéhibé, Central-West, Côte d’Ivoire

Abstract

We aim to map fracture networks in the Lobo watershed at Nibéhibé using the interpretation of aeromagnetic data. The methodology involved processing the aeromagnetic dataset with Oasis Montaj software, including preliminary corrections, removal of the International Geomagnetic Reference Field, and interpolation onto a regular grid. To enhance the structural analysis, several filtering techniques were applied, including reduction to the equator, horizontal and vertical derivatives, tilt-angle transformation, and upward continuation. These processing steps enhanced the contrast of magnetic anomalies and improved the delineation of geological discontinuities. Interpretation of the processed maps led to the identification and mapping of 88 major fractures. Directional analysis revealed two dominant fracture trends, NW–SE and NE–SW, reflecting regional tectonic controls associated with the evolution of the West African Precambrian basement. The results highlight a well-developed fracture network that plays a significant role in the structural framework of the watershed and in controlling groundwater flow. Overall, we demonstrate the effectiveness of aeromagnetic data processing techniques for structural mapping and hydrogeological exploration in crystalline basement terrains.