Report on Karangetang (Indonesia) — 14 February-20 February 2007
Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 14 February-20 February 2007
Managing Editor: Sally Sennert.
Please cite this report as:
Global Volcanism Program, 2007. Report on Karangetang (Indonesia) (Sennert, S, ed.). Weekly Volcanic Activity Report, 14 February-20 February 2007. Smithsonian Institution and US Geological Survey.
2.781°N, 125.407°E; summit elev. 1797 m
All times are local (unless otherwise noted)
On 14 February, the Alert Level at Karangetang was lowered to 2 (scale of 1-4). Seismicity had decreased in intensity and frequency since 18 November 2006. Lava flows and incandescent avalanches were not observed after 25 January 2007.
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.