JMA reported that during 4-11 September there were 52 events detected at Showa Crater (at Aira Caldera?s Sakurajima volcano), seven of which were explosive and ejected material as far as 500 m.
Ash plumes rose as high as 2.4 km above the crater rim.
Crater incandescence was observed most nights.
The Alert Level remained at 3 (on a 5-level scale).
Source: Japan Meteorological Agency (JMA)