Logo link to homepage

Report on Karangetang (Indonesia) — 26 March-1 April 2003


Karangetang

Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
26 March-1 April 2003
Managing Editor: Gari Mayberry

Please cite this report as:

Global Volcanism Program, 2003. Report on Karangetang (Indonesia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 26 March-1 April 2003. Smithsonian Institution and US Geological Survey.

Weekly Report (26 March-1 April 2003)

Karangetang

Indonesia

2.781°N, 125.407°E; summit elev. 1797 m

All times are local (unless otherwise noted)


During 17-23 March, Karangetang's South Crater generated low-level "white-gray ash emissions" and incandescence visible to 25 m above the crater. In addition, incandescent lava avalanches traveled down the volcano's flanks. During the report period, there was a significant increase in the number of volcanic and multiphase earthquakes. The Alert Level at Karangetang remained at 3 (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.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)