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). In: 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.
|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|
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.
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/).