Report on Ulawun (Papua New Guinea) — November 1993
Bulletin of the Global Volcanism Network, vol. 18, no. 11 (November 1993)
Managing Editor: Richard Wunderman.
Ulawun (Papua New Guinea) Activity level remains low
Please cite this report as:
Global Volcanism Program, 1993. Report on Ulawun (Papua New Guinea). In: Wunderman, R. (ed.), Bulletin of the Global Volcanism Network, 18:11. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN199311-252120.
Papua New Guinea
5.05°S, 151.33°E; summit elev. 2334 m
All times are local (unless otherwise noted)
"Activity remained at a low level for most of the month except for 10 and 11 November when forceful emissions of thick white vapour were observed. On the 11th, these emissions rose to ~100 m above the crater rim. Seismicity remained at a low level throughout the month."
Geologic Background. The symmetrical basaltic-to-andesitic Ulawun stratovolcano is the highest volcano of the Bismarck arc, and one of Papua New Guinea's most frequently active. The volcano, also known as the Father, rises above the north coast of the island of New Britain across a low saddle NE of Bamus volcano, the South Son. The upper 1000 m is unvegetated. A prominent E-W escarpment on the south may be the result of large-scale slumping. Satellitic cones occupy the NW and E flanks. A steep-walled valley cuts the NW side, and a flank lava-flow complex lies to the south of this valley. Historical eruptions date back to the beginning of the 18th century. Twentieth-century eruptions were mildly explosive until 1967, but after 1970 several larger eruptions produced lava flows and basaltic pyroclastic flows, greatly modifying the summit crater.
Information Contacts: I. Itikarai, and C. McKee, RVO.