Report on Karangetang (Indonesia) — 6 December-12 December 2023
Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 6 December-12 December 2023
Managing Editor: Sally Sennert.
Please cite this report as:
Global Volcanism Program, 2023. Report on Karangetang (Indonesia) (Sennert, S, ed.). Weekly Volcanic Activity Report, 6 December-12 December 2023. Smithsonian Institution and US Geological Survey.
Karangetang
Indonesia
2.781°N, 125.407°E; summit elev. 1797 m
All times are local (unless otherwise noted)
PVMBG lowered the Alert Level for Karangetang to 2 (on a scale of 1-4) on 29 November due to declining activity. According to a news article seismic data and visual observations indicated that effusion had decreased or ceased and that lava avalanches were no longer observed. Seismicity decreased and deformation data indicated deflation. The public was warned to stay 1.5 km away from both Main Crater and North Crater with an extension to 2.5 km on the S and SE flanks.
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.
Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Antara News