Nicely done! I'm thinking that the smoke was actually steam coming from the fumaroles in the volcano. It was probably glacial melt water that was flowing down into the tubes and upon making contact with the hot rocks it vaporized creating a steady column of steam. I've noticed that from your previous videos that exploding volcanoes general produce content higher in sulfur, silica and other minerals to make a much more explosive situation. Again nicely done I really enjoy your work.
