With Mt. Asama in action in a populated area, probably a good time to learn a bit about Volcanoes. So, here we go! Here is a primer on basic ash: http://www.jma.go.jp/JMA_HP/jma/jma-eng/jma-center/vaac/higai.htm This is one of the major problems that can happen: Looks like very dangerous stuff. Read the site for the full list. This would be a good thread to discuss volcanoes, cause, effect and general information. Anyone have more information on Volcanoes in general?