The Darwin VAAC reported that on 8 May an ash plume from Ibu rose to 2.4 km (8,000 ft) a.s.l.
and drifted ESE based on satellite data.
PVMBG noted that at 1821 on 9 May an ash plume rose 600 m above the crater rim and drifted S.
Seismic activity was characterized by explosions, tremor, and signals indicating rock avalanches.
According to the VAAC an ash plume drifted ESE at an altitude of 1.8 (6,000 ft) a.s.l.
on 10 May.
A 14 May VONA stated that at 1846 an ash plume rose 800 m and drifted N.
The Alert Level remained at 2 (on a scale of 1-4), and the public was warned to stay at least 2 km away from the active crater, and 3.5 km away on the N side.
Sources: Darwin Volcanic Ash Advisory Centre (VAAC),Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)