Report on Karangetang (Indonesia) — 13 December-19 December 2000
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
13 December-19 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, 13 December-19 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 5-11 December activity increased at Karangetang in comparison to previous weeks. Seismic activity was high, with an extreme increase in volcanic earthquakes. A thin plume was emitted from the main crater and Crater II; the plume rose up to 50 m above the summit and a "fire plume" reached up to 25 m above the summit. The volcano remained at Alert Level 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.