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Report on Nyamuragira (DR Congo) — 19 May-25 May 2004

Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 19 May-25 May 2004
Managing Editor: Gari Mayberry

Please cite this report as:

Global Volcanism Program, 2004. Report on Nyamuragira (DR Congo). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 19 May-25 May 2004. Smithsonian Institution and US Geological Survey.

Volcano Profile |  Weekly Report (19 May-25 May 2004)


Nyamuragira

DR Congo

1.408°S, 29.2°E; summit elev. 3058 m

All times are local (unless otherwise noted)


The Toulouse VAAC reported that satellite imagery showed a weak eruption of ash at Nyamuragira on 25 May.

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: Toulouse Volcanic Ash Advisory Centre (VAAC)