JMA reported that incandescence from Asosan?s Nakadake Crater was visible during 9-10 May.
A small eruption on 9 May produced a plume that rose 900 m above the crater rim.
Four small eruptions on 12 May generated plumes that rose to a maximum height of 1.4 km.
A plume from an eruption on 13 May rose 200 m.
Sulfur dioxide emissions were 3,600 tons per day on 10 May, and 1,700 tons per day on 13 May.
The Alert Level remained at 2 (on a scale of 1-5).
Source: Japan Meteorological Agency (JMA)