Mount Etna on Sicily is jerkily moving towards the sea under its own weight. Worst case, it can collapse and it would then trigger a tsunami that would drown the whole of South Europe with 100m tall waves.
Etna moved 4cm in one week.
https://www.nbcnews.com/mach/science/mount-etna-sliding-sea-history-shows-could-be-catastrophic-ncna925051 - reported a year ago.
Note: yikes!
