Geotechnical study in Guía de Isora

In Guía de Isora, geotechnical studies find a subsoil predominantly composed of sandstones, conglomerates and flysch, followed by outcrops of granite, gneiss and other igneous rocks. These lithologies are characteristic of competent soils, with significant strength and low compressibility, which generally allows direct and shallow foundations with good bearing capacity. However, the occasional presence of urban anthropogenic fill requires special attention, as these may show greater heterogeneity and distort the uniformity of the ground; in such cases, a targeted assessment of its compaction and load-bearing behaviour is recommended.

Seismicity in Guía de Isora is considered notable, with a record of 110 events in the last 30 years, although the maximum magnitude reported (Mmax 3) is low and does not represent a relevant structural constraint. In this setting, no risks associated with karst or expansive clay soils are detected, nor with dissolution processes caused by salts; the non-clayey subsoil ensures the absence of significant expansivity. The main constraint for the geotechnical study in the municipality lies in the correct identification of the presence of anthropogenic fill and the appropriate assessment of the depth and continuity of the competent bedrock formations.