Carl le Strange says:
September 17, 2012 at 14:11
Beg to differ a bit.
Mainly you are right, but there are at least 3 large volcanic systems out there.
You have one underwater caldera visible north of Theistareykjarbunga. This one is believed to be a part of the Theistareykir fissure swarm. It probably had eruptions as late as 1600.
Then Kolbeinsey ridge volcano (1755), and yet another out north that I know nothing about more than it is supposed to exist and a name, Höll Seamount.
This swarm is though purely tectonic. It is a microplate moving, rotating around the lock of Theistareykjarbunga. It is believed to responsible for the unusual tenacity of that particular volcano. But as such not related in any way to volcanism. Bad part is that the strain on the lock is increasing with the increased motion, and we know there is ongoing rapid inflation in the system. Researcers do expect a systemic 7M quake there sometime, when is totally unkown. And a 7M tectonic quake in a tectonic lock that at the same time is a vast magma chamber… Not nice.
I just had to write about Theistareykjarbunga here. It had nothing to do with me liking that particular volcano, I promise Irpsit.
[link to volcanocafe.wordpress.com