Report on Karangetang (Indonesia) — 25 April-1 May 2001
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
25 April-1 May 2001
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2001. Report on Karangetang (Indonesia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 25 April-1 May 2001. Smithsonian Institution and US Geological Survey.
2.781°N, 125.407°E; summit elev. 1797 m
All times are local (unless otherwise noted)
During 16-23 April lava flowed from crater I to a maximum distance of 50 m, and lava avalanches often originated from the end of the lava flow and traveled about 750 m to the Nanitu River. In addition, a medium-gray plume that likely contained ash rose 50-300 m above the main crater, and a possible steam cloud from crater II rose 200 m above the summit. A red-colored reflection was visible rising 25 m above the volcano. Karangetang remained at Alert Level 2 (on a scale of 1-4).
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.