The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported that eruptive activity continued at Lewotobi Laki-laki during 22-28 January. Explosive events were recorded on 22-23 and 25-27 January, generating gray or white-to-gray ash plumes that rose at least 1.6 km above the summit and drifted in multiple directions, though daily emissions were also observed in the absence of eruptions. Webcam images posted with the reports showed daily incandescence at the summit and incandescent material being ejected above the summit of the inner active cone during explosions. Faint rumbling was heard at the Lewotobi Laki-laki Observation Post (7 km WNW) on 28 January. The Alert Level remained at 3 (on a scale of 1-4) and the public was warned to stay 5 km away from the center of Laki-laki and 6 km in a semicircle counterclockwise from the NE to the SW.

Geological Summary. The Lewotobi edifice in eastern Flores Island is composed of the two adjacent Lewotobi Laki-laki and Lewotobi Perempuan stratovolcanoes (the "husband and wife"). Their summits are less than 2 km apart along a NW-SE line. The conical Laki-laki to the NW has been frequently active during the 19th and 20th centuries, while the taller and broader Perempuan has had observed eruptions in 1921 and 1935. Small lava domes have grown during the 20th century in both of the summit craters, which are open to the north. A prominent cone, Iliwokar, occurs on the E flank of Perampuan.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)