Abstract
El Ahmar-Boukais area is located in the northern border of the Bechar Paleozoic basin (Southwestern Algeria). The lack of structural studies in this area led us to undertake this study. The combination of field data and remote sensing analysis were used in order to highlight the Hercynian and alpine deformation in this area. For remote sensing, specific treatments (spectral enhancement, band ratios, principal component analysis, and directional filters) were applied to a Landsat 8 OLI (Operation Land Manager) image. Field measurement led us to validate the results. A mapping has value only with a field data collection. The results of the two approaches are similar, indicating a complementarity for better mapping. Four directions of tectonic structures are evidenced: N-S, NE-SW, E-W, and NW-SE; these directions are raked at least two different tectonic phases. The results issued from image processing techniques and field data were used to constrain the structural map where all tectonic structures are represented.
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