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Report on Lokon-Empung (Indonesia) — 10 September-16 September 2003


Lokon-Empung

Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
10 September-16 September 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, 10 September-16 September 2003. Smithsonian Institution and US Geological Survey.

Weekly Report (10 September-16 September 2003)

Lokon-Empung

Indonesia

1.358°N, 124.792°E; summit elev. 1580 m

All times are local (unless otherwise noted)


According to a report from aircraft personnel, on 12 September at 1510 an ash plume emitted from Lokon-Empung rose to a height of ~7.6 km a.s.l. and drifted W. The plume was not visible on satellite imagery.

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.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)