Geotechnical study in Zaratamo

In Zaratamo, the predominant geological substratum consists of sandstones, conglomerates and flysch, accounting for more than 64% of the ground. These formations provide a good competent base for foundations, generally exhibiting a high bearing capacity. Secondarily, there are fine sands, silts and, in smaller proportions, carbonate formations such as limestones, dolomites and marbles. The occasional presence of the latter may require a specific assessment of foundation parameters; however, in the absence of soft soils such as muds or peats, the ground typically offers favourable conditions for supporting structures.

The seismic activity in Zaratamo can be described as notable, with 94 recorded events over 30 years and a maximum magnitude of 3.7; therefore, it is recommended to consider seismicity in the structural analysis and design, although the risk of high magnitudes is low. The non-clayey substratum rules out the risk of expansivity, which minimises concern regarding differential movements associated with clayey soils. In conclusion, the most relevant aspect for the geotechnical study in Zaratamo is the correct characterisation of the dominant formations in order to define the optimum foundation solutions in an environment of notable seismicity but without additional severe constraints.