Report on Lokon-Empung (Indonesia) — 19 February-25 February 2003
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 19 February-25 February 2003
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2003. Report on Lokon-Empung (Indonesia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 19 February-25 February 2003. Smithsonian Institution and US Geological Survey.
1.358°N, 124.792°E; summit elev. 1580 m
All times are local (unless otherwise noted)
An eruption at Lokon-Empung on 23 February around 1100 produced an ash cloud that rose 2.5 km above the crater. According to news reports, ash fell in the villages of Kinilouw and Kakaskasen and the Tondano Lake. On the 24th authorities put residents near the volcano on alert and banned recreational activities on Lokon-Empung's flanks. Two small eruptions on the 24th sent ash 200 m above the volcano. Lokon-Empung was at Alert Level 3 (on a scale of 1-4).
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.