Report on Karangetang (Indonesia) — 27 January-2 February 2021
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
27 January-2 February 2021
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2021. Report on Karangetang (Indonesia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 27 January-2 February 2021. Smithsonian Institution and US Geological Survey.
2.781°N, 125.407°E; summit elev. 1797 m
All times are local (unless otherwise noted)
The Darwin VAAC reported that on 29 January a pilot observed an eruption plume rising from Karangetang to 2.4 km (8,000 ft) a.s.l. and drifted SW. The next day an ash plume identified in satellite images rose to 3 km (10,000 ft) a.s.l. and drifted SW. The Alert Level remained at 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 island. 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 in the historical record (Catalog of Active Volcanoes of the World: 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.