Report on Karangetang (Indonesia) — 29 November-5 December 2000
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
29 November-5 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, 29 November-5 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 volcanic activity during 21-27 November was similar to the previous week. A thin ash plume was observed rising ~600 m above the summit from the main crater and Crater II. Booming sounds were frequently heard from the volcano's summit, and a "red flame" was observed some nights rising ~100 m above the summit. Seismic activity was high and dominated by discontinuous tremor. In total, 21 small explosions were recorded. The Alert Level remained at 2 (ranging from 1 to 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.