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Report on Kavachi (Solomon Islands) — September 1981


Scientific Event Alert Network Bulletin, vol. 6, no. 9 (September 1981)
Managing Editor: Lindsay McClelland.

Kavachi (Solomon Islands) Bubbling and discolored water

Please cite this report as:

Global Volcanism Program, 1981. Report on Kavachi (Solomon Islands) (McClelland, L., ed.). Scientific Event Alert Network Bulletin, 6:9. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198109-255060


Solomon Islands

8.991°S, 157.979°E; summit elev. -20 m

All times are local (unless otherwise noted)

Solair pilots who overflew Kavachi in mid-September reported gas bubbling and discolored sea water. No eruption columns were observed.

Further Reference. Johnson, R.W., and Tuni, D., 1986?, Kavachi, an active forearc volcano in the western Solomon Islands: reported eruptions between 1950 and 1982, in Taylor, B., and Exon N.F., (eds.), Seafloor spreading ridge, subduction, volcanism, and sedimentation offshore.

Geological Summary. Named for a sea-god of the Gatokae and Vangunu peoples, Kavachi is one of the most active submarine volcanoes in the SW Pacific, located in the Solomon Islands south of Vangunu Island. Sometimes referred to as Rejo te Kvachi ("Kavachi's Oven"), this shallow submarine basaltic-to-andesitic volcano has produced ephemeral islands up to 1 km long many times since its first recorded eruption during 1939. Residents of the nearby islands of Vanguna and Nggatokae (Gatokae) reported "fire on the water" prior to 1939, a possible reference to earlier eruptions. The roughly conical edifice rises from water depths of 1.1-1.2 km on the north and greater depths to the SE. Frequent shallow submarine and occasional subaerial eruptions produce phreatomagmatic explosions that eject steam, ash, and incandescent bombs. On a number of occasions lava flows were observed on the ephemeral islands.

Information Contacts: F. Coulson, Ministry of Natural Resources, Honiara.