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) (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.
Geological Summary. The Lokong-Empung volcanic complex, rising above the plain of Tondano in North Sulawesi, includes four peaks and an active crater. Lokon, the highest peak, has a flat craterless top. The morphologically younger Empung cone 2 km NE has a 400-m-wide, 150-m-deep crater that erupted last in the 18th century. A ridge extending 3 km WNW from Lokon includes the Tatawiran and Tetempangan peaks. All eruptions since 1829 have originated from Tompaluan, a 150 x 250 m crater in the saddle between Lokon and Empung. These eruptions have primarily produced small-to-moderate ash plumes that sometimes damaged croplands and houses, but lava-dome growth and pyroclastic flows have also occurred.
Information Contacts: VSI; T. Casadevall, USGS & VSI.