JMA reported that incandescence from Minamidake crater (at Aira Caldera?s Sakurajima volcano) was visible during 4-12 February.
At 1919 on 7 February an event generated a plume that rose 1.3 km above the crater rim and ejected material 1.3-1.7 km from the crater.
During 8-12 February there were four events, three of which were explosive.
Plumes rose as high as 1.9 km, and boulders were ejected as far as 900 m from the crater.
The Alert Level remained at 3 (on a 5-level scale).
Source: Japan Meteorological Agency (JMA)