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Report on Nyamuragira (DR Congo) — 25 January-31 January 2012

Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 25 January-31 January 2012
Managing Editor: Sally Kuhn Sennert

Please cite this report as:

Global Volcanism Program, 2012. Report on Nyamuragira (DR Congo). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 25 January-31 January 2012. Smithsonian Institution and US Geological Survey.

Volcano Profile |  Weekly Report (25 January-31 January 2012)


Nyamuragira

DR Congo

1.408°S, 29.2°E; summit elev. 3058 m

All times are local (unless otherwise noted)


The VolcanoDiscovery Team observed the fissure eruption at Nyamuragira that began on 6 November 2011 during 22-25 January 2012 from the newly formed cinder cones located about 10 km E of the summit crater. They reported three coalescent cones with the largest cone containing a small lava lake. The lake ejected spatter every few seconds as high as 200 m above the summit; individual bombs reached the base of the cone. Lava flows from the vent extended several kilometers N. Numerous small breakouts formed secondary flows, and a large breakout about 2 km N of the cone fed a large lava flow about 20 m wide. Burning forests were reported to the NNE.

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.

Source: VolcanoDiscovery