According to PVMBG ground-based observers noted ash plumes from Semeru rising 500 m above the summit and drifting SE on 17 September.
An ash plume rose 200 m and drifted N the next day.
The Alert Level remained at 2 (on a scale of 1-4).
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Erta Ale (Ethiopia)
