Lokon, Sulawesi, Indonesia

Location: 1.36N, 124.79E
Elevation: 5200 ft (1580 m)
Last Updated: September 26, 2003

Lokon is a stratovolcano in Sulawesi, Indonesia. It is located just a few kilometers west of Mahawu crater on Lokon. It has had 21 eruptions in historic times. Lokon and its twin volcano, Empung, rise about 800 m above the plain of Tondano. Lokon is higher than Empung, and the summits are only 2.2 km apart. The two volcanoes are among the most active volcanoes of Sulawesi.

All the photos on this page were taken on 16 January 1996.


September 16, 2003

On Sept. 12 (1510), an ash plume rose ~7.6 km a.s.l and then drifted W.

This information was summarized from the GVP/USGS Weekly Volcanic Activity Report

April 15, 2003

After April 1st eruption, activity decreased for 5 days. Seismicity was dominated by tremor due to gaseous release and a "white-thick ash plume" rose to low levels. It remained at an Alert Level 2.

This information was summarized from the GVP/USGS Weekly Volcanic Activity Report


April 8, 2003

Volcanic earthquake activity was high. On the 1st, an explosion produced a ~1.5 km-high ash column and also ejected incandescent material. Tremor earthquakes were recorded up to April 3rd and the Alert Level stayed at a 2.

This information was summarized from the GVP/USGS Weekly Volcanic Activity Report


April 1, 2003

Fewer ash explosions occurred and there was a significant decrease in the number of emission earthquakes. On the 27th, an explosion ejected material 400 m-1.5 km high. The Alert Level at Lokon-Empung was lowered to a 2.

This information was summarized from the GVP/USGS Weekly Volcanic Activity Report


March 25, 2003

From March 10-16, low ash clouds were observed and volcanism remained at relatively high levels. Emission and tremor earthquakes dominated seismicity and the Alert Level stayed at 3.

This information was summarized from the GVP/USGS Weekly Volcanic Activity Report


March 11, 2003

Activity continued with 12 explosions producing 300 m-high "white-gray ash columns." On the 2nd, an explosion, including volcanic earthquake activity and tremor, sent an ash column 1.5 km high. Lokon-Empung remained at an Alert Level 3.

This information was summarized from the GVP/USGS Weekly Volcanic Activity Report


February 25, 2003

An eruption on the 23rd produced a 2.5 km-high ash cloud and, on the following day, two more small eruptions sent clouds 200 m above the crater. The volcano was at an Alert Level 3.

This information was summarized from the GVP/USGS Weekly Volcanic Activity Report


February 18, 2003

A significant increase in volcanic earthquakes was recorded and four explosions producing ash clouds occurred throughout the report week. On Feb. 12th, the Alert Level was raised from a 3 to a 4 and continuous tremor was recorded until the 13th.

This information was summarized from the GVP/USGS Weekly Volcanic Activity Report


April 30, 2002

The level of activity remained high at Lokon this week. The volcano remained in alert level 3.

This information was summarized from Smithsonian Institution's Preliminary Notices of Volcanic Activity.


April 23, 2002

Several eruptions occurred in the last two weeks. The eruption of a dark cloud rising about 1 km above the volcano occurred on April 10th. On the 13th and 14th, thirteen gas-and-ash explosions were observed. This increased in activity led VSI to raise the Alert level from 2 to 3 (on a scale 1 to 4).

This information was summarized from Smithsonian Institution's Preliminary Notices of Volcanic Activity.


February 19, 2002

This week, observers saw small volcanic plumes rising 50 to 150 m above the crater rim. The volcano remained at Alert Level 2 (on a scale of 1-4).

This information was summarized from Smithsonian Institution's Preliminary Notices of Volcanic Activity.


24 April 2001

On 20 May, an eruption occurred at the Lokon Volcano. Ash rose 900 m above the volcano and fell over a wide region around the volcano. The eruption was also accompanied by tremor.

This information was summarized from Smithsonian Institution's Preliminary Notices of Volcanic Activity.


30 March 2001

On 26 March, an eruption sent an ash plume 1,500 m above Lokon's crater. The ash fell on several villages ~3.5 km from the crater. After the explosion, volcanic tremor was recorded.

This information was summarized from Smithsonian Institution's Preliminary Notices of Volcanic Activity.


8 February 2001

On 28 January, explosions began and produced glowing volcanic bombs that fell on the North slope of the volcano. Strong sulphurous odors were detected. On 29 January, an ash plume rose up to 300 m above the crater. The Alert Level at the volcano was raised from level 2 to 3 (on a scale of 1-4). For more information on Indonesia's volcanoes, visit the Volcanological Survey of Indonesia Web site.

This information was summarized from Smithsonian Institution's Preliminary Notices of Volcanic Activity.



A view of Lokon volcano from the village of Kinilow. The crater of Lokon is approximately a 1-1.5 hour walk from this village. This photograph was taken and copyrighted by Karl-Heinz Haefele.


A cooled lava flow on the way to Lokon crater from Kinilow. This photograph was taken and copyrighted by Karl-Heinz Haefele.


A view of the crater of Lokon north of the peak of Lokon. This photograph was taken and copyrighted by Karl-Heinz Haefele.


A view of the crater of Lokon.


Another view inside the crater of Lokon.


Sources of Information

Captions provided by Karl-Heinz Haefele

Simkin, T., and Siebert, L., 1994, Volcanoes of the world: Geoscience Press, Tucson, Arizona, 349 p.



Images of Volcanoes To VolcanoWorld