Carl le Strange says:
September 20, 2012 at 14:55
Here is a map showing the two faultlines and how the currently active faultline run down to Theistareykir, then runs up to the point marked 1976 which interestingly enough is the end of Krafla fissure swarm, and that most likely erupted in 1976 after a M5 quake.
As you all see it is a rather neat square shaped microplate.
Now put your hand up almost to your screen and the map. Put your lefthand thumb against where you have Theistareykir, that is a seismic lock that does not move (call it a hinge if you wish). Then put a finger where you have Grimsey. Now, twist your hand clockwise without moving the thumb. That is how the microplate is moving.
Interesting is it not? Around that little plate you have all sorts of earthquakes known to man.
Somewhere this explains Theistareykjarbungas large eruptive volumes. I do not know of any other volcano on the planet that is driven by so many different factors. Hotspot, mantleplume, rifting of the MAR, and it’s own little plate tectonics.
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