JMA reported that during 7-15 October ash plumes rose as high as 1.3 km above Asosan?s summit crater rim, causing ashfall in areas downwind including periodically at the Kumamoto Regional Meteorological Observatory.
Crater incandescence was occasionally visible at night.
The sulfur dioxide emission rate was very high at 4,000 tons per day on 11 October.
The Alert Level remained at 2 (on a scale of 1-5).
Source: Japan Meteorological Agency (JMA)