Bárðarbunga update

I once again reiterate that it is Icelandic Met Office and Almannavarnadeild ríkislögreglustjóra that has the authority to issue warnings for Iceland in regards of eruptions and jökulhlaups. For airborne ash advisories it is in the following order London VAAC and IMO that issues advisories. That being said here follows a brief update. Almannavarnadeild ríkislögreglustjóra…

One Slab or Two? Arc-to-Continent Collision

Sorry, chocoholics this is not about chocolate or cake 😦 (although, as this is Volcanocafe, it could be!).  No, we are looking at arc-to-continent collision round the Banda Sea 🙂 I continued my plotting of Indonesian earthquakes eastward, this time choosing the Banda Sea where the “swirly bit” on the map looks interesting; and, is…

Update on Herðubreið

The earthquake swarm at Herðubreiðartögl has now continued unabated for four days without a letup, during the first two days there were 4 earthquakes above M3 with the largest earthquake at M3.9 and by now the count of earthquakes has passed 1 000. As such this is not the largest earthquake swarm to hit this volcano,…

Magmatic or Tectonic Earthquake?

I get this question often about Iceland, especially when there is an earthquake swarm. The problem is that it is rarely clear cut if it is magmatic or tectonic when it happens in Iceland. First of all you have all of the rift zones being tectonic, but they are also subject to rift and hotspot…