Ten volcanoes with super-eruption potential: Part III

Here comes the conclusion to the series, the 3 volcanoes that I considered the likeliest to produce a VEI-8 eruption. 3. Calabozos and neighbours (Chile) This volcano is located in Chile. It forms part of a little known, little studied, silicic flare-up of the Southern Andes Volcanic Zone. Steepening of the subducting Payenia Slab gave…

Batholiths and flare-ups

An eruption that ejects more than 1000 km3 of material (ash, pumice, rock…) is considered a super-eruption, a VEI-8. These represent the greatest volcanic events that have taken place during human existence. Such apocalyptic phenomena attract a lot of attention, from scientists, volcanoholics and doomsayers. The term supervolcano has become increasingly popular but also increasingly…

Big basalt blasts I. The trigger

Rhyolite has more silica, this makes it more viscous, more explosive and in turn more dangerous. Basalt is the opposite, fluid, well-behaved, safe. This could be a phrase out of any geology textbook, I can almost feel some readers getting ahead of me and thinking what I am obliged to say. But there are exceptions!…

Future calderas

Volcanoes erupt all the time. It may seem a quiet time to us but that is because most eruptions are small and low impact, and stay below the radar. An excellent daily overview can be found on http://lechaudrondevulcain.com/blog-spotlight-two-column/ As I write this, it lists on-going eruptions at Sinabung, Etna, Stromboli, and Sabancaya. Volcanodiscovery also lists…

The 3 x 4½ km summit caldera of Mount Katmai, Alaska, that formed after the 1912 VEI 6 Novarupta eruption (Wiki)

Calderas

This is a re-post that has been re-posted before. But we attract new readers and sometimes it is worth republishing something. Especially since this is about Icelandic (and other) calderas, something that has been raised in the comments recently. This post was originally written during the Holuhraun eruption and associated Bardarbunga collapse, and you will…

The Hotness of Grimsvötn

As far as volcanoes go, we like to think of them as immutable giants that rarely if ever change. We like to see Grimsvötn as a glacier covered giant of a volcano, that almost always produce moderate ashy eruptions, that are relatively speaking short-lived. Yes, once upon a blue moon it will do something big,…

Taal Update – Ongoing Intrusion

Guest post from Héctor (DustDevil). There will be a further update either later today or tomorrow as events have changed since Héctor wrote this post. The Main Crater of Taal seems to have calmed down, doesn’t it? However fissures are breaking the ground apart, the river dries, Lake Taal falls and strong earthquakes keep coming.…

The rise and fall of Anak Krakatau

It was the largest volcanic eruption since the start of the world-wide web. The invention of telegraphy in the 1850’s had made long distance connections instantaneous. It changed the world. Newspapers were the most obvious beneficiaries, being able to bring gossip news from far away places. And in this landscape, Krakatau exploded. 36,000 people died…

Living dangerously: another Grimsvotn prediction

  Grimsvötn is heading for an eruption. There can be no doubt about that. Of course, it is always heading for an eruption. This volcano has ADHD. For Grimsvötn, more than a decade of brooding is unusual: normally it just throws it out. A misplaced snow flake can set it off. And it produces not…

The Ruminarian, again

By GeoLurking, January 8, 2014 (republished) Curmudgeon “an ill-tempered person full of stubborn ideas or opinions” Well, if the shoe fits, I guess I’ll wear it. But… I don’t come about it lightly. To me, stuff has to make sense. One thing I abhor is mindless ranting that is specifically intended to scare people. What…