UAV and field survey observations on the November 26th 2022 Celario flowslide, Ischia Island (Southern Italy)

On 26th November 2022, a heavy cloudburst affected Ischia Island (Southern Italy) causing a flash flood and triggering several flowslides. The most affected municipality was Casamicciola Terme, where this event produced 12 casualties, more than 200 people evacuated and several damages to the buildings and the road network. The largest flowslide involved Celario watershed, which started as a small slide (around 10 m3) on the top of Mt. Epomeo at 703 m a.s.l. of height and impacted downward at 645 m a.s.l., successively channelising in the catchment. This study summarises the geological and geomorphological evidence collected during the field investigation of the Celario flowslide and analyses the remotely sensed UAV data to reconstruct the occurred scenario. Finally, some considerations on the relationships between the occurred damage and the flowslide impact are discussed.