Report on Nyamulagira (DR Congo) — 16 November-22 November 2011
Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 16 November-22 November 2011
Managing Editor: Sally Sennert.
Please cite this report as:
Global Volcanism Program, 2011. Report on Nyamulagira (DR Congo) (Sennert, S, ed.). Weekly Volcanic Activity Report, 16 November-22 November 2011. Smithsonian Institution and US Geological Survey.
1.408°S, 29.2°E; summit elev. 3058 m
All times are local (unless otherwise noted)
On 18 November, Virunga National Park reported that lava flows from the eruption along a fissure 11-12 km ENE of Nyamuragira's main crater had possibly stalled. An observer aboard an overflight a few days before noted that the lava did not appear to have moved any further N. A photo taken from the Rumangabo headquarters (7.5 km NE of the eruption site) on 16 November showed a tall cinder cone with lava fountains rising above the rim.
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 13 km NNW 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.
Source: Virunga National Park