On 12 October at 2330 there was an explosion at Lewotobi Lakilaki, a stratovolcano of Lewotobi, that was accompanied by a weak thundering sound. Ash fell as far as 5 km away and an ash column rose ~500 m above the volcano. According to VSI, eruptions at Lewotobi usually occur over an extended period of time, therefore they expect more explosions to take place in the next couple of weeks to months. On 16 October, Lewotobi was at Alert Level 4 (the highest level).

Geological Summary. The Lewotobi "husband and wife" twin volcano (also known as Lewetobi) in eastern Flores Island is composed of the Lewotobi Lakilaki and Lewotobi Perempuan stratovolcanoes. Their summits are less than 2 km apart along a NW-SE line. The conical Lakilaki has been frequently active during the 19th and 20th centuries, while the taller and broader Perempuan has erupted only twice in historical time. Small lava domes have grown during the 20th century in both of the crescentic summit craters, which are open to the north. A prominent flank cone, Iliwokar, occurs on the E flank of Perampuan.

Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Darwin Volcanic Ash Advisory Centre (VAAC)