Based on information from JMA, the Tokyo VAAC reported that during 11-12 February eruptions from Asama produced plumes that rose to altitudes of 3-3.7 km (10,000-12,000 ft) a.s.l. and drifted NE, E, and SE. JMA reported that on 16 and 17 February eruptions produced colored plumes containing ash that rose to an altitude of 3 km (10,000 ft) a.s.l. and drifted E. Incandescence in the crater was seen on web cameras.
Sources: Japan Meteorological Agency (JMA), Tokyo Volcanic Ash Advisory Center (VAAC) – “Reports provided courtesy of the Smithsonian’s Global Volcanism Program and the US Geological Survey’s Volcano Hazards Program.”