Report on Nyamulagira (DR Congo) — 22 February-28 February 2023
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
22 February-28 February 2023
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2023. Report on Nyamulagira (DR Congo). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 22 February-28 February 2023. Smithsonian Institution and US Geological Survey.
1.408°S, 29.2°E; summit elev. 3058 m
All times are local (unless otherwise noted)
The Observatoire Volcanologique de Goma (OVG) reported that the lava lake on Nyamulagira’s crater floor continued to be active during 13-19 February. Seismicity was generally low, characterized by a few long-period earthquakes located up to 15 km deep along the large fracture connecting the Nyamuragira and Nyiragongo. High concentrations of carbon dioxide were measured in the Mazuku areas, and in an area to the W of a camp in the Lac Vert district in Bulengo; OVG warned residents to stay away from those areas.
Geological Summary. Africa's most active volcano, Nyamulagira (also known as Nyamuragira), is a massive high-potassium basaltic shield about 25 km N of Lake Kivu and 15 km NE of the steep-sided Nyiragongo volcano. The summit is truncated by a small 2 x 2.3 km caldera that has walls up to about 100 m high. Documented eruptions have occurred within the summit caldera, as well as from the numerous flank fissures and cinder cones. A lava lake in the summit crater, active since at least 1921, drained in 1938, at the time of a major flank eruption. Recent lava flows extend down the flanks more than 30 km from the summit as far as Lake Kivu; extensive lava flows from this volcano have covered 1,500 km2 of the western branch of the East African Rift.