Report on Karangetang (Indonesia) — 27 March-2 April 2002
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
27 March-2 April 2002
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2002. Report on Karangetang (Indonesia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 27 March-2 April 2002. Smithsonian Institution and US Geological Survey.
2.781°N, 125.407°E; summit elev. 1797 m
All times are local (unless otherwise noted)
During 18-24 March, lava avalanches traveled down Karangetang's flanks. On 23 March at 1115 a thunderous sound from the main crater was followed by lava avalanches down the Kahetang and Batu Awang rivers. During the report period, observers noted a thick plume rising 400 m above the crater rim and a 75-m-high "red reflection" rising above the volcano's summit. Seismicity slightly decreased in comparison to the previous week. 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 island. 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 have produced pyroclastic flows.