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Report on Karangetang (Indonesia) — 4 November-10 November 2015


Karangetang

Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 4 November-10 November 2015
Managing Editor: Sally Sennert.

Please cite this report as:

Global Volcanism Program, 2015. Report on Karangetang (Indonesia) (Sennert, S, ed.). Weekly Volcanic Activity Report, 4 November-10 November 2015. Smithsonian Institution and US Geological Survey.

Weekly Report (4 November-10 November 2015)

Karangetang

Indonesia

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

All times are local (unless otherwise noted)


Based on observations conducted at the Karangetang Volcano Observation Post in the village of Salili, PVMBG reported during 28 October-4 November that activity remained stable. The lava dome was incandescent at night and produced a lava flow that traveled 200 m S. Incandescent avalanches from the lava-flow front traveled as far as 2 km E down the Batuawang and Kahetang drainages. Seismicity decreased, but continued to be dominated by avalanche signals. The Alert Level remained at 3 (on a scale of 1-4); visitors and residents were warned not to approach Karangetang within a 4-km radius.

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)