Geotechnical study in Cortegana

In Cortegana, the geotechnical subsoil is dominated by slates and schists, accounting for more than 60% of the ground, accompanied by occasional outcrops of granite, gneiss and other igneous rocks. These lithologies provide a competent and robust base, with low permeability that improves ground stability and favours bearing capacity for most shallow or semi-deep foundations. However, the localised presence of groundwater masses may affect certain specific areas, requiring a targeted hydrogeological analysis before defining the foundation solution.

Regarding seismic risk, Cortegana shows moderate seismicity, with 18 events over the last 30 years and a maximum recorded magnitude of 3, which implies a low structural impact for conventional projects and does not require special considerations in earthquake-resistant design. No development of karst is detected, nor is there any risk of expansive soils, since the subsoil is not of clay origin. Thus, the main geotechnical constraint in this municipality is the uniformity and competence of the metamorphic rocks, enabling reliable and safe foundation design solutions.