JMA reported that incandescence from Suwanosejima's Ontake Crater was visible at night during 5-9 April.
Four explosions generated ash plumes that rose as high as 1.6 km above the crater rim and ejected bombs 600 m away.
Ashfall was reported in Toshima village (4 km SSW) during 8-9 April.
The Alert Level remained at 2 and the public was warned to stay 1 km away from the crater.
Source: Japan Meteorological Agency (JMA)