Report on Karangetang (Indonesia) — 12 July-18 July 2006
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 12 July-18 July 2006
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2006. Report on Karangetang (Indonesia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 12 July-18 July 2006. Smithsonian Institution and US Geological Survey.
2.781°N, 125.407°E; summit elev. 1797 m
All times are local (unless otherwise noted)
The Alert Status of Karangetang was raised on 13 July from 2 to 3 (on a scale of 1-4) due to increased eruptive activity. On 12 July, lava flows were observed moving E toward the Kahetang and Batu Awang rivers at a maximum distance of 2 km from the vent. White emissions reached a height of 600 m above the crater (7,800 ft a.s.l.).
Geologic Background. Karangetang (Api Siau) volcano lies at the northern end of the island of Siau, north 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 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 has also produced pyroclastic flows.