Report on Nyamuragira (DR Congo) — 29 November-5 December 2006
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 29 November-5 December 2006
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2006. Report on Nyamuragira (DR Congo). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 29 November-5 December 2006. Smithsonian Institution and US Geological Survey.
1.408°S, 29.2°E; summit elev. 3058 m
All times are local (unless otherwise noted)
Based on satellite imagery, the Toulouse VAAC reported that during 29 November-2 December emissions from Nyamuragira produced ash plumes to altitudes of 3-6.1 km (10,000-20,000 ft) a.s.l. The plumes drifted W and NW. By mid-morning on 2 December, ash plumes were no longer visible.
Geologic Background. Africa's most active volcano, Nyamuragira, is a massive high-potassium basaltic shield about 25 km N of Lake Kivu. Also known as Nyamulagira, it has generated extensive lava flows that cover 1500 km2 of the western branch of the East African Rift. The broad low-angle shield volcano contrasts dramatically with the adjacent steep-sided Nyiragongo to the SW. The summit is truncated by a small 2 x 2.3 km caldera that has walls up to about 100 m high. Historical eruptions have occurred within the summit caldera, as well as from the numerous fissures and cinder cones on the flanks. A lava lake in the summit crater, active since at least 1921, drained in 1938, at the time of a major flank eruption. Historical lava flows extend down the flanks more than 30 km from the summit, reaching as far as Lake Kivu.