Vulcano island: the new high resolution digital surface model post 2021-2022 volcanic unrest

During the years 2021-2022 Vulcano island was affected by a volcanic crisis characterized by a remarkable increase in fumarolic activity, intensified seismicity and ground deformations. With the aim of reproducing with high detail the island surface after this crisis, an Airborne Lidar survey was carried out on 4^th August 2023. More than 200 × 10⁶ 3D Lidar points were processed to create a new Digital Surface Model at a very high spatial resolution (50 cm). This model reproduces the elevation surface of all natural and anthropic elements constituting the island. The model was validated through a set of Ground Control Points and a vertical accuracy of 8 cm was obtained. This level of accuracy, combined with the spatial resolution of 50 cm, makes the model particularly suitable for detailed geomorphological investigations. In addition, associated with the derived coastline, it provides the most up-to-date and accurate 3D topography for the assessment of natural hazards, such as changes in the volcanic activity state, earthquakes and mass movements triggered by extreme rainfalls.