JMA reported that volcanic earthquakes began to be detected at Suwanosejima on 4 August and volcanic tremors were occasionally recorded during 4-9 August.
Four eruptive events occurred at Ontake Crater on 5 August and one on 6 August.
Large blocks were ejected as far as 400 m and ash plumes rose as high as 1.5 km above the crater rim.
The Alert Level remained at 2 (on a 5-level scale).
Source: Japan Meteorological Agency (JMA)