Grímsvötn grumbling

Just spotted this little grumble under Vatnajökull which is rather reminiscent of last years minor eruption and glacial floods.

Usual caveats about tremors and eruptions apply, so until someone can come up with a monitor that can measure the frequencies that theoretically indicate when a volcano is about to go foom, we're stuck with conjecture and old fashioned methods of measurement. I'm waiting to see what the big brains over at UBC are going to come up with.