The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported that eruptive activity at Lewotobi Laki-laki continued during 23-29 April. Gray or gray-to-black ash plumes rose 500 m above the summit, to as high as 4 km above the summit, and drifted multiple directions during 24-28 April. Though the view was often obscured due to weather or volcanic plumes, incandescence around the upper flanks was visible in a webcam image at 0215 on 25 April. At 2115 on 27 April an eruptive event generated a dense gray as plume that rose 4 km above the summit and drifted N and NE. A corresponding webcam images showed trails of incandescent material on the upper flanks. The Alert Level remained at 3 (on a scale of 1-4) and the public was warned to stay 6 km away from the center of Laki-laki.

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)