JMA reported that incandescence from Minamidake Crater (at Aira Caldera?s Sakurajima volcano) was visible at night during 24-31 January.
Two explosions occurred on 28 January.
One of them, recorded at 1319, produced an ash plume that rose 3.4 km above the crater rim and ejected blocks as high as 1.7 km.
Ash fell in Arimura (4.5 km SE) and Kurokami (4 km E).
JMA noted that until this event explosion plumes had not exceeded 3 km since 5 April 2021.
The Alert Level remained at 3 (on a 5-level scale), and residents were warned to stay 2 km away from the crater.
Source: Japan Meteorological Agency (JMA)