Iceland seismicity – monthly review (July 2017 edition)

Ever since I began plotting earthquake data for Iceland and generally for the world (where data is available), I was planning to do a monthly review of the seismicity in Iceland, so we can keep track of it on a monthly basis. Of course, if there is any stronger activity or something unusual happens, usually…

Living dangerously: a Grimsvotn prediction

Grimsvotn (‘Grim’s lakes’) is Iceland’s secret. Of all its volcanoes, this is the most frequent erupter, exploding as often as every 5-10 year. It also causes jokulhaups with decadal frequency. And worst of all, it is a mass murderer, which has killed as many as a quarter of Iceland’s population. And all of this is…

The island at the end of the world: Bouvetøya

If you want to get away from it all, this is the place for you. If you prefer to experience your volcanoes in utter isolation, you could not do any better. If you have seen it all, come and see this. Find yourself a globe (for younger readers, this is a historical version of google…

Volcanic unrest in Iceland

Iceland suffers from eruptions on average every 3 to 7 years. And in between we tend to look at other volcanoes with interest. And as time goes by we forget that Iceland at any time can have larger and faster eruptions than pretty much any other spot on earth. During this phase of volcanic unrest…

Unrest at Fagradalsfjall

The pleistocene volcano of Fagradalsfjall has started a phase of uncertainty due to a medium sized tectonic swarm associated with the volcano. At the time of writing there have been around 400 earthquakes ranging up to M4.0 in size. Fagradalsfjall last erupted during the last glacial period in Iceland. The earthquake swarm is fairly intense…

Volcano forecasts and Campi Flegrei

There are a few volcanoes that I do not feel comfortable writing about, and those are volcanoes that are far too close to large human settlements. The reason is obvious, it is far too likely that I will write about an event that will kill a lot of people. There are two ways to increase…

Images of Mount Fuji

In this land of many volcanoes, one mountain stands out. Few people will have heard of Ontake or Sakurajima – but everyone knows about Mount Fuji. It is the tallest of Japan’s volcanoes, 3776 meters high, with a summit crater which is 500 meter across. The smooth cone shows how young the surface is: this…

Greip, Gjálp’s Mysterious Sister

In this article, we move away from the usual suspects in Icelandic volcanism and turn our attention to a feature many of us have noticed over the years. This feature has only been revealed from seismicity, but here I try to unravel the past and future activity as well as give this feature a sense…

The winter of Huaynaputina

The mountain isn’t there. In its place, an explorer will find a double crater in the ground, several kilometers across, with thick ash on one side and an open side into a majestic river valley on the other. The debris is evidence of a violent past but it gives little hint of what was there…

Grimstone vs Yellowvötn: Battle of the Giants

Carl – May 9, 2014 (re-post) In the west corner of the ring you find Yellowstone wearing blue, red and white striped trunks and in the east corner you find Grimsvötn wearing Fire & Ice colored trunks. Welcome to a spectacular fight about who is the largest, meanest volcano on the block. As the fighters are…