RVO reported that during 20-26 June, ash plumes from Rabaul caldera’s Tavurvur cone rose to altitudes less than 1.7 km (5,600 ft) a.s.l. and drifted W and NW. Roaring noises were reported. During 26-30 June, steam-and-ash plumes rose to altitudes of 0.9-1.7 km (3,000-5,600 ft) a.s.l. and drifted NW. Nighttime incandescence was noted. During 23-30 June, ashfall was reported in areas downwind, including in Rabaul and surrounding towns.
Source: Herman Patia, Rabaul Volcano Observatory (RVO) – “Reports provided courtesy of the Smithsonian’s Global Volcanism Program and the US Geological Survey’s Volcano Hazards Program.”