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Report on Karangetang (Indonesia) — May 2005


Bulletin of the Global Volcanism Network, vol. 30, no. 5 (May 2005)
Managing Editor: Richard Wunderman.

Karangetang (Indonesia) Ongoing seismicity during January-February 2005; lava avalanche in January

Please cite this report as:

Global Volcanism Program, 2005. Report on Karangetang (Indonesia) (Wunderman, R., ed.). Bulletin of the Global Volcanism Network, 30:5. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN200505-267020



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

All times are local (unless otherwise noted)

Ongoing seismicity continued at Karangetang during January-February 2005. Lava avalanches were noted on 3 January and during the week of 17-23 January. The volcano was last discussed in a report on thermal alerts and a pilot's report of an ash plume to 7.5 km altitude (BGVN 29:03, which updated through May 2004). Table 11 presents a summary of the reported seismic and other data during January and February 2005.

Table 11. A summary of observations made at Karangatang during 3 January-February 2005. Courtesy of DVGHM.

Date Deep volcanic (A-type) Shallow volcanic (B-type) Multiphase Emission Tremor Amplitude Avalanches Tectonic Alert Level
03 Jan 2005 3 10 2 2 0.5-3 mm 5 8 3
04 Jan 2005 9 4 -- -- 0.5-1 mm -- 7 3
05 Jan 2005 2 11 1 -- -- -- 3 3
17-23 Jan 2005 61 125 6 -- -- 36 36 3

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.

Information Contacts: Directorate of Volcanology and Geological Hazard Mitigation (DVGHM), Jalan Diponegoro 57, Bandung 40122, Indonesia (URL: http://www.vsi.esdm.go.id/).