Report on Ulawun (Papua New Guinea) — March 2000

Bulletin of the Global Volcanism Network, vol. 25, no. 3 (March 2000)
Managing Editor: Richard Wunderman.

Ulawun (Papua New Guinea) Minor vapor emissions continue in early 2000

Please cite this report as:

Global Volcanism Program, 2000. Report on Ulawun (Papua New Guinea). In: Wunderman, R (ed.), Bulletin of the Global Volcanism Network, 25:3. Smithsonian Institution. http://dx.doi.org/10.5479/si.GVP.BGVN200003-252120.

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Ulawun

Papua New Guinea

5.05°S, 151.33°E; summit elev. 2334 m

All times are local (unless otherwise noted)


Low-level activity continued in January with weak emissions of thin white vapor throughout the month. Slightly stronger emissions occurred on 17 and 26 January. Emissions from the summit crater during February consisted of fluctuating volumes of thin-to-thick white vapor being released gently. March emissions consisted of thin white vapor. The seismograph remained out of operational.

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-trending 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 (Email: rvo@datec.com.pg).