Bárdarbunga, Gjálp and Onwards

Lately Iceland has suffered a long series of earthquake swarms that have ambled all over the island. Earthquake swarms are common in Iceland, that is not the issue, the problem is that they this time came in a swarm of swarms, all of them containing at least one earthquake above M3. Before we take a…

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…