Global Volcanism Program | Image GVP-01694
Explosive activity that ejected ash and blocks from Niri Mbwelesu crater was observed on 16 September 1990. The Niri Mbwelesu crater formed adjacent to Mbwelesu crater in 1989 when Mbwelesu was also active but no longer contained a lava lake. During 1990 activity was concentrated in Mbwelesu, Niri Mbwelesu and Niri Mbwelesu Taten craters. Activity remained more or less constant into 1991.
Photo by Michel Lardy, 1990 (ORSTROM, Vanuata).