In my view, I am convinced that this is an eruption and is of strombolian style. Incandescence in the crater looks fairly intensive. I estimate the eruption to have begun around 19-23 April but could be possible to have started earlier. The last recorded eruption on Bristol Island came in 1956 in an area between Turmoil Point and Mount Sourabaya.
|What shows a likely strombolian activity on Mount Sourabaya. SOURCE: Landsat 8/USGS/NASA.|
|Activity continues as of 1st May 2016. SOURCE: Landsat 8/USGS/NASA.|