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Report on Nyamuragira (DR Congo) — August 1987

Scientific Event Alert Network Bulletin, vol. 12, no. 8 (August 1987)
Managing Editor: Lindsay McClelland.

Nyamuragira (DR Congo) Correction to July 1986 eruption site

Please cite this report as:

Global Volcanism Program, 1987. Report on Nyamuragira (DR Congo). In: McClelland, L. (ed.), Scientific Event Alert Network Bulletin, 12:8. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198708-223020.

Volcano Profile |  Complete Bulletin


Nyamuragira

DR Congo

1.408°S, 29.2°E; summit elev. 3058 m

All times are local (unless otherwise noted)


New observations show that the July 1986 eruption vent was located 4.5 km S of the caldera's edge at the S foot of Kitazungurwa in Mashiga (figure 6) rather than . . . 3.5 km SW of the caldera's edge.

Figure (see Caption) Figure 6. Map of the Nyamuragira/Nyiragongo area by N. Zana (1984), appended with vents and flows through 1988. The heavy dashed line indicates the approximate path of the 1989 flow.

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.

Information Contacts: B. Louant, GEOVAR, Kigali, Rwanda.