JMA reported nighttime crater incandescence at Minamidake Crater (at Aira Caldera?s Sakurajima volcano) during 14-20 January.
Small eruptive events were occasionally recorded by the seismic network.
A total of 21 explosions were detected, with ash plumes rising as high as 2 km above the crater rim and large blocks ejected as far as 1.3 km away from the crater.
The Alert Level remained at 3 (on a 5-level scale).
Source: Japan Meteorological Agency (JMA)