Report on Karangetang (Indonesia) — 20 December-26 December 2000
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 20 December-26 December 2000
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2000. Report on Karangetang (Indonesia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 20 December-26 December 2000. Smithsonian Institution and US Geological Survey.
2.781°N, 125.407°E; summit elev. 1797 m
All times are local (unless otherwise noted)
The VSI reported that during 12-18 December, activity increased at Karangetang in comparison to the previous week. A thin plume continued to be emitted from the main crater and Crater II, but it rose higher than last week: up to 150 m above the summit. A "red flame," possibly indicating illumination of the plume by lava fountaining or incandescent material at the summit, was observed rising up to 75 m above the summit. Overall seismic activity decreased in comparison to the previous week. The volcano remained at Alert Level 2 (ranging from 1 to 4).
Geologic Background. 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.