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Report on Lokon-Empung (Indonesia) — 19 February-25 February 2003


Lokon-Empung

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.

Weekly Report (19 February-25 February 2003)

Lokon-Empung

Indonesia

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).

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.

Sources: Darwin Volcanic Ash Advisory Centre (VAAC), News 24, Agence France-Presse (AFP)