Report on Kelut (Indonesia) — 31 October-6 November 2007
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 31 October-6 November 2007
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2007. Report on Kelut (Indonesia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 31 October-6 November 2007. Smithsonian Institution and US Geological Survey.
7.93°S, 112.308°E; summit elev. 1731 m
All times are local (unless otherwise noted)
CVGHM reported that a series of earthquakes from Kelut during 24-31 October were dominated by shallow events and tremor. Seismicity intensified during 2-3 November, and then decreased on 4 November. On 2 November the temperature of the crater lake was 50 degrees Celsius, the highest temperature recorded. On 4 November, white plumes rose to an altitude of 2 km (6,600 ft) a.s.l. and drifted N. Observations of video footage from a closed-circuit television camera revealed that a black mass protruded from the lake and was likely the cause of the plumes. The Alert Level remained at 4 (on a scale of 1-4).
Geologic Background. The relatively inconspicuous Kelut stratovolcano contains a summit crater lake that has been the source of some of Indonesia's most deadly eruptions. A cluster of summit lava domes cut by numerous craters has given the summit a very irregular profile. Satellitic cones and lava domes are also located low on the E, W, and SSW flanks. Eruptive activity has in general migrated in a clockwise direction around the summit vent complex. More than 30 eruptions have been recorded from Gunung Kelut since 1000 CE. The ejection of water from the crater lake during the typically short but violent eruptions has created pyroclastic flows and lahars that have caused widespread fatalities and destruction. After more than 5000 people were killed during an eruption in 1919, an ambitious engineering project sought to drain the crater lake. This initial effort lowered the lake by more than 50 m, but the 1951 eruption deepened the crater by 70 m, leaving 50 million cubic meters of water after repair of the damaged drainage tunnels. After more than 200 deaths in the 1966 eruption, a new deeper tunnel was constructed, and the lake's volume before the 1990 eruption was only about 1 million cubic meters.