Report on Lokon-Empung (Indonesia) — March 1987
Scientific Event Alert Network Bulletin, vol. 12, no. 3 (March 1987)
Managing Editor: Lindsay McClelland.
Lokon-Empung (Indonesia) Single gas explosion
Please cite this report as:
Global Volcanism Program, 1987. Report on Lokon-Empung (Indonesia). In: McClelland, L (ed.), Scientific Event Alert Network Bulletin, 12:3. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198703-266100.
1.358°N, 124.792°E; summit elev. 1580 m
All times are local (unless otherwise noted)
Lokon-Empung was relatively quiet during March, with only a single gas explosion, on 11 March at 0340, which produced a plume to 900 m height. Normal activity consisted of a white gas plume continuously emitted to a maximum of 300 m above Tompaluan crater.
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; T. Casadevall, USGS & VSI.