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Report on Lokon-Empung (Indonesia) — December 1986

Scientific Event Alert Network Bulletin, vol. 11, no. 12 (December 1986)
Managing Editor: Lindsay McClelland.

Lokon-Empung (Indonesia) Continued small explosions and seismicity

Please cite this report as:

Global Volcanism Program, 1986. Report on Lokon-Empung (Indonesia). In: McClelland, L (ed.), Scientific Event Alert Network Bulletin, 11:12. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198612-266100.

Volcano Profile |  Complete Bulletin


Lokon-Empung

Indonesia

1.358°N, 124.792°E; summit elev. 1580 m

All times are local (unless otherwise noted)


Explosions from Tompaluan Crater continued through early January at rates of 30-80/day. Maximum plume heights were 500-800 m. The Kakaskasen Volcano Observatory recorded 2-20 volcanic earthquakes/day; the average number of events was ~10/day.

Geologic Background. The twin volcanoes Lokon and Empung, rising about 800 m above the plain of Tondano, are among the most active volcanoes of Sulawesi. Lokon, the higher of the two peaks (whose summits are only 2 km apart), has a flat, craterless top. The morphologically younger Empung volcano to the NE has a 400-m-wide, 150-m-deep crater that erupted last in the 18th century, but all subsequent eruptions have originated from Tompaluan, a 150 x 250 m wide double crater situated in the saddle between the two peaks. Historical eruptions have primarily produced small-to-moderate ash plumes that have occasionally damaged croplands and houses, but lava-dome growth and pyroclastic flows have also occurred. A ridge extending WNW from Lokon includes Tatawiran and Tetempangan peak, 3 km away.

Information Contacts: VSI.