Report on Ulawun (Papua New Guinea) — July 2000
Bulletin of the Global Volcanism Network, vol. 25, no. 7 (July 2000)
Managing Editor: Richard Wunderman.
Ulawun (Papua New Guinea) Vapor emissions during May and June; moderate seismicity in June
Please cite this report as:
Global Volcanism Program, 2000. Report on Ulawun (Papua New Guinea) (Wunderman, R., ed.). Bulletin of the Global Volcanism Network, 25:7. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN200007-252120
Papua New Guinea
5.05°S, 151.33°E; summit elev. 2334 m
All times are local (unless otherwise noted)
This report covers the period from April to June 2000. There were no unusual reports from Ulawun in April. Throughout May, moderate to thick white vapor was emitted. Emissions in June consisted of thin white vapor. However, on 5 and 7 June, the emissions were thick white vapor. Seismic activity for June was at a moderate level.
Geological Summary. 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 N coast of the island of New Britain across a low saddle NE of Bamus volcano, the South Son. The upper 1,000 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, D. Lolok, K. Mulina, and F. Taranu, Rabaul Volcano Observatory (RVO), P.O. Box 386, Rabaul, Papua New Guinea.