JMA reported that during 4-11 January incandescence from Minamidake Crater (at Aira Caldera?s Sakurajima volcano) was often visible nightly.
The sulfur dioxide emission rate remained high and reached extremely high levels of 5,000 tons per day on 6 January.
An explosion at 1642 on 4 January produced an ash plume that rose 1.8 km above the crater rim and merged into weather clouds.
An explosion at 1133 on 11 January generated an ash plume that rose 1.3 km.
The Alert Level remained at 3 (on a 5-level scale).
Source: Japan Meteorological Agency (JMA)