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Report on Karangetang (Indonesia) — 14 November-20 November 2001


Karangetang

Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
14 November-20 November 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, 14 November-20 November 2001. Smithsonian Institution and US Geological Survey.

Weekly Report (14 November-20 November 2001)

Karangetang

Indonesia

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

All times are local (unless otherwise noted)


During 5-11 November volcanic activity decreased at Karangetang in comparison to the previous week. No lava flows had been observed since 25 October. White plumes rose 100 m over the main crater and 50 m above Crater II. A "red reflection" was visible up to 20 m over the volcano. Multiphase earthquakes associated with lava dome growth were recorded. During 12-18 November visual observations revealed an increase in gas pressure, and plume emissions rising 600 m above the main crater. In addition, volcanic earthquakes increased in comparison to the previous week and no multiphase earthquakes were recorded. 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.

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