JMA reported that four explosions at Suwanosejima?s Ontake Crater were recorded during 22-30 November.
The highest ash plume rose 2 km, and material was ejected 300 m from the crater.
Ashfall was reported in an area 4 km SSW on 23 November.
Crater incandescence was visible at night.
The Alert Level remained at 2 (on a 5-level scale).
Source: Japan Meteorological Agency (JMA)