Grimsvötn 2011 eruption. Photographed by Jóhann Ingi Jónsson.

Rapid inflation at Grimsvötn

I have been tracking what is happening at Grimsvötn since the last eruption and the entire hubbub at Bárðarbunga. If you look at the GFUM GPS station you can see the slow and steady inflation speeding up a bit before the intrusion into the Bárðarbunga system started. In the days prior to the intrusion the…

Image by Tom. Upper part shows a closed propagating dyke. The lower shows a rift open down to the mantle. The upper version draws its magma from a central volcano, the lower from the mantle. Upper alternative would give a smaller eruption than the lower.

Bárðarbunga reader question

Richie, one of our readers emailed in a good question that is a good starting point for a brief update on Bárðarbunga. “Could you do an article comparing this intrusion to others? Looking at the post it appears that it is almost 40 Km long but how wide is it and in terms of volume.…

Valverde in El Hierro, close to the current activity. Image from Wikimedia Commons.

Activity at El Hierro + Volcano of the Month

As time goes by we understand more and more about the activity under El Hierro. The Canarian Hotspot has several plumeheads reaching up under the volcanically active islands in the Island chain. It seems that for unknown reasons the activity has changed at depth so that El Hierro has become far more active than previously.…

If one looks closely one can see that La Restinga is nested among a lot of small and not so small cones and vents.

El Hierro going bananas?

I have for quite some time had an issue with the Mogi-model as soon as it is used outside of a central volcano. At a central volcano it makes sense to use a point sourced half sphere as a model for predicting amount of magma intruding into the system from given GPS-coordinates. If only the…