ERT geophysical survey for Landslide Risk Management in Coastal Areas: Case Studies of Brovinje and Havišće (Croatia)

This work presents the application of Electrical Resistivity Tomography (ERT) as a key geophysical technique for the characterization of the shallow subsurface in two pilot sites, Brovinje and Havišće, located in coastal areas of Croatia. These investigations were conducted within the framework of the Project RESONANCE – Interreg Italy-Croatia, aiming to improve landslide risk prevention and management. The ERT surveys provided crucial insights into the geological and structural settings of the areas. At the Brovinje site, ERT imaging allowed for the characterization of the structural style and the identification of lithological units, discerning between high-resistivity limestone and lower-resistivity marl. At the Havišće site, the surveys revealed the presence of incoherent dumped material, approximately 3-5 meters thick, and highlighted significant fracture zones. The results demonstrate the effectiveness of ERT in providing valuable subsurface geological information essential for comprehensive landslide risk assessment and mitigation strategies in coastal environments.