Report on Lokon-Empung (Indonesia) — 5 December-11 December 2012
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
5 December-11 December 2012
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2012. Report on Lokon-Empung (Indonesia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 5 December-11 December 2012. Smithsonian Institution and US Geological Survey.
1.358°N, 124.792°E; summit elev. 1580 m
All times are local (unless otherwise noted)
Based on information from CVGHM and the WAAA MWO (in Ujung Pandang,Indonesia), the Darwin VAAC reported that an eruption from Lokon-Empung produced an ash plume that rose to an altitude of 3.4 km (11,000 ft) a.s.l. on 6 December and drifted S. Ash was not detected in satellite imagery. On 10 December a plume rose to an altitude of 4.3 km (14,000 ft) a.s.l.
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.