Geotechnical Risk Assessment and Geological Origin of Building Fracturation in Agadez City (North Niger)

Baraou Idi Souley (Department of Geology, University of Agadez, Agadez, Niger)
Abdoulwahid Sani (Department of Geology, University of Agadez, Agadez, Niger)
Abdoul Wahab Djibo Maïga (High Authority for Atomic Energy of Niger (HANEA, Niger), OTICE, Niamey, Niger)
Moussa Konaté (Department of Geology, University of Niamey, Niamey, Niger)

Article ID: 4697


The Agadez city is built on the faulted and fractured sandstones formation of the “Agadez Sandstones”, which deposit in unconformity on the Precambrian basement of the Aïr Mountain. The present study focuses on the geotechnical risk assessment and geological origin of building fracturation in Agadez city. A methodological approach integrating measurement of fractures planes affecting the buildings and their statistical analysis has been implemented. Statistical analysis of obtained data showed that in 100 fractured buildings, about 3% buildings are at risk of collapse (very high risk), 64% buildings are fractured (medium risk of collapse), and 34% buildings are cracked (lower risk of collapse). These results showed as well that the nature of the material (rheology) influences the buildings fracturation. Indeed, the buildings made from cement are more easily fractured than buildings made from clay materials. Statistical analysis of fracture planes reveals that the geotechnical risk associated with buildings fracturation propagates in NW-SE, corresponding to the major directions of risk propagation, mainly dipping in northwest sectors (zones) of the Agadez city. The interpretation of geological and geophysical data combined to those obtained in the case of this study, reveals that the risk associated with buildings fracturation in Agadez city is caused by geological seismic events and or anthropogenic activities (explosive firing on the uranium mining sites like Somaïr and Cominak).


Geotechnical risks; Geological origin; Buildings fracturation; Fractures; Cracks; Faults; Agadez city; Niger

Full Text:



[1] Bonnier., 1989. Agadez sandstones nappes. Ministry of Hydrolic-DRE. Project NER/86/001, Niger. (In French)

[2] Clermonté, J., Moussa, Y., Lang, J., et al., 1991. Paleozoic and Mesozoic basin in a strike-slip zone: the Tim Mersoi in the Arlit Region, in the western l’Aïr. Meeting report of Sciences academy, Paris 312, II, 1189-1195. (In French)

[3] Tauzin, P., 1981. Geological context of Uranium ore deposit in Eastern edge of Tim Mersoi sedimentary basin, intern report Minatome, Niger. pp. 15. (In French)

[4] COGEMA, 1977. Afasto geological map at 1/200 000 and explanatory notice. Direction of Mines and Geology, Niamey. pp. 31. (In French)

[5] Sani, A., Konaté, M., Karimou, D.H., et al., 2020. Polyphasic tectonic history of the N70° DASA Graben (northern, Niger). Global Journal of Earth and Environmental Science. 5(3), 58-72.

[6] Guiraud, R., Boureïma, O., Robert., J.P., 1981. Evidence of deformation revealing a shorteneing in the Mesozoic of Aïr peripheral (Niger). Meeting Report of Sciences Academy. 292(9), 753-756. (In French)

[7] Wahab, D.M.A., 2017. Location map of seismic focus on the African continent, OTICE Department, HANEA, Niger. (In French)

[8] Mamadou, M., 2016. Metallogenic system of Uranium ore deposit associated to Arlit fault (Tim Mersoi basin, Niger. PhD Thesis of Lorraine University. pp. 402. (In French)

[9] Wagani, I., Maman, S.B., Alhassane, I., 2019. Structural study of Akola uranium ore deposit and geotechnical risk related to the extracting method in the Cominak, Niger. Rev. Ivoir. Sci. Technol. 34, 230- 246. (In French)

[10] Passchier, C.W., Trouw, R.A.J., 2005. Microtectonics (Second edition), Springer-Verlag, Berlin, Germany. pp. 371.

[11] Declan, G., De Paor, Gloria, E., 1987. Stratigraphic and structural consequences of fault reversal: An example from the Franklinian Basin, Ellesmere Island. in Geology. DOI:;2

[12] Ball, E., 1980. An example of very consistent brittle deformation over a wide intracontinental area: the late Pan-African fracture system of the Tuareg and Nigerian shield. Tectonophysics. 16, 363-379.

[13] Liégeois, J.P., Latouche, L., Boughrara, M., et al., 2003., The Latea metacraton. (Central Hoggar, Tuareg shield, Algeria): behavior of an old passive margin during the Pan-African orogeny. Journal of African Earth Sciences. 37, 161-190.

[14] Aissa, D.E., Christian, M., 2017. Controls on gold deposits in Hoggar, Tuareg Shield (Southern Algeria). Journal of African Earth Sciences. 127, 136-145.

[15] PRDSM, 2005. Geophysic interpretation map of Aïr Mountains. Ministry of Mines and Industrial development, Niger. pp. 55. (In French)

[16] Genik, G.J., 2013. Regional framework, structural and petrolium aspect of rift basins in Niger, Chad and the Central African Republic (CRA.). Tectonophysics. pp. 169-185.

[17] Guiraud, R., Bosworth, W., 1997. Senonian basin inversion and rejuvenation of rifting in African and Arabia: synthesis and implications to plate-scale tectonics. Tectonophysics. 282, 39-82.

[18] Wilson, M., Guiraud, R., 1992. Magmatism and rifting in West and Central Africa, from Late Jurassic to recent times. Tectonophysics. 213, 203-225.

[19] Ahmed, Y., Konaté, M., Harouna, M., 2016. Tectono-magmatic reactivation of Téfidet Cretaceous trough during Cenozoic (Aïr, Niger). Bulletin De La Societe Geologique De France. 187(2), 73-83.

[20] Konate, M., Yacouba, A., Moussa, H., 2019. Structural evolution of the Tefidet trough (East Aïr, Niger) in relation with the West African Cretaceous and Paleogene rifting and compression episodes. Comptes rendus - Geoscience. 351, 355-365. DOI:



  • There are currently no refbacks.
Copyright © 2022 Author(s)

Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.