A NEW CALDERA HAS FORMED !!! behind the common erupting caldera.. on the back
side of the mountain... a new area has exploded ! It began steaming MONTHS ago..
October 2011. 桜島の噴火によるキノコ雲

Better put.. a dormant caldera has
re-awakened.. per the japanese agency which monitors this volcano.. its has been
a few years since this portion of the volcano has shown any kind of
eruption.

locals are starting to post video of the mushroom
cloud: