PVMBG reported that a Strombolian eruption at Lewotolo continued during 13-19 January.
Gray-and-white ash plumes rose 200-700 m above the summit daily and rumbling sounds were reported.
Strombolian explosions ejected material 100-500 m above the summit, and incandescent material was ejected as far as 1.5 km SE from the crater.
The Alert Level remained at 3 (on a scale of 1-4) and the public was warned to stay 4 km away from the summer crater.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)