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.]
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.