Originally Posted by oldoberon
...if this blows big style...
Bardarbunga is a stratovolcano, as was Krakatoa, and has the theoretical potential to blow big style. But if you read about Krakatoa, there was a preceding period of major earthquakes.
Bardarbunga has only got up to Richter 5 so far. We will most likely get a lot more warning with a period of major quakes before any major event.
But a Mount St Helens type minor bang is of course quite possible.