Tsunamis are a worldwide menace with specific local threats. It pays to learn your local situation and keep the knowledge fresh in your community.
About nine days ago, @Volcanologist tweeted, "A mini erosive scour at the base of the Fasnia Ignimbrite, Tajao, Tenerife." (Click here to see accompanying photo.) If you take a look at that picture, you can see numerous similarities to the above and previous post. In the above photo, the lens cap is in the same spot as in the previous post, and I've just moved the frame a bit to the right, and come in a little closer. @Volcanologist confirmed that this looked like an ignimbrite, too, though I