Report on Karangetang (Indonesia) — September 1980
Scientific Event Alert Network Bulletin, vol. 5, no. 9 (September 1980)
Managing Editor: David Squires.
Karangetang (Indonesia) Cauliflower-shaped cloud; incandescent tephra
Please cite this report as:
Global Volcanism Program, 1980. Report on Karangetang (Indonesia). In: Squires, D. (ed.), Scientific Event Alert Network Bulletin, 5:9. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198009-267020.
2.781°N, 125.407°E; summit elev. 1797 m
All times are local (unless otherwise noted)
A seismograph recorded an explosion . . . on 12 September at 0410. The next day at 1140, a cauliflower-shaped eruption column rose 1,200 m above the crater. Similar explosions had occurred on 3 July and three times in August, depositing incandescent tephra over an area 3 km in diameter.
Geologic Background. 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: A. Sudradjat and L. Pardyanto, VSI.