New ash explosion with plume reaching 3 km – Lokon volcano, Indonesia


Another ash explosion with plume rising up to 3 km occurred at 12:10 local time today, December 11, 2012 followed by a smaller one at 12:41 and 13:16 local time on active Indonesian volcano Lokon.

The first explosion was relatively violent and produced a plume rising approx. 3000 m visible from Manado city 15 km to the north and the explosion sound caused people in nearby Tomohon to run out on the streets. The following 2 explosions were much smaller and produced plumes only a few 100 m in height. Volcanologists stationed in Kakaskasen said that volcanic tremor was recorded almost continuously.

Small to medium-sized explosive ash eruptions continue to occur every 1-3 days (such as on 3, 6, 7 and 9 December). Ash plumes observed from ground and by satellite reached estimated 10-17,000 ft (3-5 km) altitude. (VolcanoDiscovery)

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 2.2 km apart), has a flat, craterless top. The morphologically younger Empung volcano 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 (GVP).

Featured image: Photo by Agus Solihin, 1998 (Volcanological Survey of Indonesia).


Commenting rules and guidelines

We value the thoughts and opinions of our readers and welcome healthy discussions on our website. In order to maintain a respectful and positive community, we ask that all commenters follow these rules.

One Comment

Leave a reply

Your email address will not be published. Required fields are marked *