RVO reported that seismicity at Manam began increasing on 16 July and fluctuated between low and moderate levels through the 29th.
A slow steady increase of RSAM values was recorded on 30 July, and RVO stated that an observer had reported that incandescent material had been ejected from the summit.
The Darwin VAAC noted that a sustained and intense thermal anomaly was visible in satellite images that same day.
During 31 July-1 August ash plumes drifted NW at an altitude of 4.3 (14,000 ft) a.s.l.
and a lava flow at the summit was visible.
Sources: Darwin Volcanic Ash Advisory Centre (VAAC),Rabaul Volcano Observatory (RVO)