During 2-29 June, volcanic activity continued at Karangetang at moderate levels, with low-level ash plumes rising above South Crater and gas emissions from North Crater. During 2-8 June, lava avalanches traveled as far as 1 km toward Batang River. During 9-15 June, lava avalanches traveled as far as 1 km down Beha River and ~250 m toward Batu Awang River. Karangetang remained at Alert Level 2 (on a scale of 1-4).

Geological Summary. Karangetang (Api Siau) volcano lies at the northern end of the island of Siau, about 125 km NNE of the NE-most point of Sulawesi. The stratovolcano contains five summit craters along a N-S line. It is one of Indonesia's most active volcanoes, with more than 40 eruptions recorded since 1675 and many additional small eruptions that were not documented (Neumann van Padang, 1951). Twentieth-century eruptions have included frequent explosive activity sometimes accompanied by pyroclastic flows and lahars. Lava dome growth has occurred in the summit craters; collapse of lava flow fronts have produced pyroclastic flows.

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