I have read theories on this thread that these erruptions can lead to ash clouds hanging in the air for years.
However from recent violent eruptions I am of the understanding that these large ash clouds are associated with the initial 'explosion'. That initial explosive release of pressure that has been building up for years. Once the mountain has blown its top and that pressure has been realeased, the violence will subside.
I am no geologist, but I think this whole drama of airspace closures will be behind us in a few days.
However with the small margins airlines operate under these days, I hope all will recover from a couple of days sitting on the ground.
DB
