Geotechnical study in San Vicente de la Barquera

In San Vicente de la Barquera, the subsoils are predominantly formed by limestones, dolomites and marbles—high-strength materials that usually provide adequate bearing capacity for shallow foundations. Secondary deposits include sandstones and conglomerates, which are also suitable for supporting structural loads. Fine sands and silts are very uncommon in the area, so their presence rarely affects the foundation, although they may host shallow aquifers. Given this natural context, it is essential to specifically assess the presence of cavities or voids in the bedrock subsoil before defining the type of support.

Seismic activity in the municipality is notable, with 145 recorded events over 30 years and a maximum magnitude (Mmax) of 4, which requires specific consideration in structural design to ensure safety against possible ground movements. In addition, the development of karst processes in carbonate rocks makes it necessary to carry out a detailed verification of the existence of cavities and ground stability prior to any foundation. The absence of expansive clays minimises risks of heave, with the main geotechnical constraint being the possible presence of karst processes and the prominent seismicity.