I'm no geologist, but listening to early reports, the tremendous amount of ash is happening due to this volcano's magma being cooled by the glacier that is attached to it, so rather than just blowing it's top like it should, it's simply...spewing and seeping. That pretty much prolongs things. I imagine the early cooling would cause a lot of pressure to build within other active volcano chains, thus causing them to blow, relieving that pressure. If this cloud persists, it could present an issue for myself and my unit, as we are supposed to be deploying shortly. I would hate to have it delayed.
As for fighting the Volcano, Vegita, you need to check out Joe Vs. The Volcano. Or Dante's Peak. Or...Volcano. And remember that in 2012, the world begins to end thru the core heating up, then earthquakes, THEN volcanoes, then typhoons/tsunamis, just general unpleasantness.
Defiance, you do not want ash clouds where you are, as you don't want the problems that come with the cloud. May be pretty to look at from above or afar, but not underneath.