JMA recorded 13 explosions at Suwanosejima?s Ontake Crater during 3-10 January.
Eruption plumes rose as high as 1.4 km above the crater rim and material was ejected as far as 600 m from the crater.
Explosion and rumbling sounds, as well as ashfall, were reported in areas 4 km SSW.
Crater incandescence was visible at night.
The Alert Level remained at 2 (on a 5-level scale).
Source: Japan Meteorological Agency (JMA)