Report on Lokon-Empung (Indonesia) — 20 June-26 June 2007
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 20 June-26 June 2007
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2007. Report on Lokon-Empung (Indonesia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 20 June-26 June 2007. 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 visual observations, CVGHM reported that during 18-25 June diffuse ash plumes from Lokon-Empung rose to an altitude of 1.6 km (5,200 ft) a.s.l. The Alert Level remained at 2 (on a scale of 1-4). [Correction: diffuse white plumes from Lokon-Empung's Tompaluan crater rose to an altitude of approximately 1.2 km (3,900 ft) a.s.l.]
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.