JMA reported that 45 explosions at Suwanosejima's Ontake Crater produced eruption plumes that rose as high as 1.7 km above the crater rim during 23-30 April.
Large volcanic bombs were ejected 400 m from the crater.
Nighttime crater incandescence was visible during 24-25 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)