JMA reported that during 17-19 April white plumes from Asosan?s Nakadake Crater rose 1 km above the crater rim.
A very small eruption was recorded at 0824 on 19 April, producing a plume that rose 500 m above the crater rim and drifted S.
During an overflight that same day scientists observed a pool of hot water on part of the crater floor and a weak volcanic gas odor.
According to the Tokyo VAAC a plume rose 500 m and drifted E at 1842.
A weak volcanic gas odor was also evident.
The Alert Level remained at 2 (on a scale of 1-5).
Sources: Japan Meteorological Agency (JMA) ,Tokyo Volcanic Ash Advisory Center (VAAC)