Aut cum scuto aut in scuto
and they talk about the "Ring of Fire" in the Pacific: it appears that we have a "Ring of Fire" in the Atlantic as well
The Canary Islands are volcanic in origin, so this isn't too unexpected. I remember reading a few years ago: One of the islands - I think it's this one, La Palma, the westernmost - has a large fault bisecting the island that is thought to be questionably stable. If it were to fail, and a large piece of the island were to slide into the ocean, the resulting tsunamis could wipe out the Caribbean, Florida, Bahamas, etc.
These eruptions are either caused by global warming or by mean tweets.Take your pick.