It is a bit surprising that I have never gotten around to writing a complete guide of Icelandic volcanoes in view of how much I have written about them.Obviously this can’t be a complete write up for all of the volcanoes; instead it will be a list of the volcanoes with a short part written about the current activity, if there is any.These 3 volcanoes are of the rifting fissure type (with that I mean that they have massive fissure swarms that rift, not that they are driven by rifting processes per see), have massive central volcanoes with huge calderas and massive systems of magma chambers.Normally they have frequent small scale to medium sized eruptions, and only have their large eruptions when the SIFZ (south Icelandic fissure zone) endures a rifting episode.1 = Between 0 and 1 percent (pretty much a dormant volcano that has erupted since the last ice age) 2 = Between 1 and 10 percent (this would be a dormant volcano that has given signs of awakening) 3 = Between 10 and 25 percent (active volcano with moderate eruption frequency or with a low eruption frequency that is giving signs of increased activity) 4 = Between 25 and 50 percent (active volcano with a high eruption frequency giving off signs of activity on a continued basis) 5 = Between 50 and 80 percent (very active volcano with a high recurrence rate of eruptions and giving off signs of being on the road to an eruption) See these numbers as a handy way of discerning between the volcanic deadbeats and the volcanoes that is likely to blast off soon.Askja Askja is a central volcano with a nested caldera in the Northern Volcanic Zone (NVZ) with a 190 kilometers and 20 kilometers wide volcanic fissure swarm.
He assigns it the lowest risk level, and most would agree with this.
The two triple junction Behemoths of Iceland The other two are different from the first 3 in many respects.
Both of them are triple-junction volcanoes, driven almost entirely by rifting processes, are mainly fissure volcanoes with fairly unknown internal systems.
The lagoon is always changing, so no two trips will ever be the same.
Bring some binoculars to see the seals swimming by, or catch some of the Icelandic birds hovering above.