Based on pilot observations and analysis of satellite imagery, the Tokyo VAAC reported that on 5 November an ash plume from Suwanose-jima rose to an altitude of 1.5 km (5,000 ft) a.s.l. and drifted NE. The JMA indicated that during 7-8 November explosion or eruption plumes rose to altitudes of 1.2-1.8 km (4,000-6,000 ft) a.s.l. and drifted E. An explosion was reported on 12 November.
Source: 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.”