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Report on Lokon-Empung (Indonesia) — March 2006


Bulletin of the Global Volcanism Network, vol. 31, no. 3 (March 2006)
Managing Editor: Richard Wunderman.

Lokon-Empung (Indonesia) Steaming and seismically active during January-October 2005

Please cite this report as:

Global Volcanism Program, 2006. Report on Lokon-Empung (Indonesia) (Wunderman, R., ed.). Bulletin of the Global Volcanism Network, 31:3. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN200603-266100



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

All times are local (unless otherwise noted)

The twin volcanoes of Lokon and Empung exhibited low levels of activity during 2005. Table 9 is a summary of reported gas emissions and number of volcanic earthquakes during 2005.

Table 9. Summary of activity at Lokon-Empung during 2005, indicating the height and composition of plumes observed and the numbers of earthquakes recorded. Data courtesy of CVGHM.

Date Deep volcanic (A-type) Shallow volcanic (B-type) Plume height Plume color and composition
18 Jan-24 Jan 2005 9 75 -- --
24 Jan-30 Jan 2005 3 88 35 m white gas
02 May 2005 3 44 -- --
09 May 2005 3 139 50 m white gas
26 Sep-02 Oct 2005 6 117 15 m white gas
03 Oct-09 Oct 2005 5 126 25 m white gas

Geological Summary. 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.

Information Contacts: Dali Ahmad, Hetty Triastuty, Nia Haerani and Suswati, Center of Volcanology and Geological Hazard Mitigation (CVGHM), Jalan Diponegoro 57, Bandung 40122, Indonesia (URL: http://www.vsi.esdm.go.id/).