Abstract

Characterisation of the fractures network precambrian basement Gagnoa area (Central West Ivory Coast) Located in the central-western part of Cte d'Ivoire, the Gagnoa region consists of sedimentary volcano and granitoid formations with developed fracturing. The objective of this study is to map the fracture network of the Precambrian basement of Gagnoa using Landsat-7 ETM+ satellite images and to characterize it from a statistical point of view. The raw satellite images were processed to enhance linear features considered to be fractures. The lineament map obtained after processing is very dense and contains 3,010 lineaments of varying sizes and orientations. The validation of the different linear structures was done on the basis of geophysical studies and the hydrographic map of the study area. The distribution of fracture orientations shows some fracture heterogeneity in the region. The statistical analysis performed on this fracture network shows that the distribution of fracture lengths follows a power law with a characteristic coefficient = 2.756, reflecting the advanced stage of fracture development. All the results contribute to a better knowledge of the fracture networks and groundwater functioning in the Gagnoa region. Translated with www.DeepL.com/ Translator (free version)