Report on Lokon-Empung (Indonesia) — October 1986
Scientific Event Alert Network Bulletin, vol. 11, no. 10 (October 1986)
Managing Editor: Lindsay McClelland.
Lokon-Empung (Indonesia) Periodic explosions; no additional juvenile tephra
Please cite this report as:
Global Volcanism Program, 1986. Report on Lokon-Empung (Indonesia). In: McClelland, L. (ed.), Scientific Event Alert Network Bulletin, 11:10. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198610-266100.
1.358°N, 124.792°E; summit elev. 1580 m
All times are local (unless otherwise noted)
Phreatic explosions continued through October. No lava flow has been observed. No juvenile material has been reported since breadcrust bombs were ejected in early September.
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: Suratman and T. Casadevall, VSI.