JMA reported that an explosion at Suwanosejima?s Ontake Crater was recorded at 0428 on 9 November.
A plume could not be confirmed because weather clouds obscured views, but large pieces of pumice were observed being ejected 700 m S.
Explosions had not been recorded since 2 June.
The Alert Level remained at 2 (on a 5-level scale).
Source: Japan Meteorological Agency (JMA)