RVO reported that during 21-26 March white and occasional gray ash plumes from Rabaul caldera’s Tavurvur cone rose 500 m above the crater and drifted in variable directions. Incandescence from the summit crater was seen at night. Light ashfall was reported S of Duke of York Islands, about 20 km E.
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.”
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Volcano World : Supplement 