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Report on Ulawun (Papua New Guinea) — 13 May-19 May 2009

Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 13 May-19 May 2009
Managing Editor: Sally Kuhn Sennert

Please cite this report as:

Global Volcanism Program, 2009. Report on Ulawun (Papua New Guinea). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 13 May-19 May 2009. Smithsonian Institution and US Geological Survey.

Volcano Profile |  Weekly Report (13 May-19 May 2009)


Ulawun

Papua New Guinea

5.05°S, 151.33°E; summit elev. 2334 m

All times are local (unless otherwise noted)


RVO reported that white vapor plumes from Ulawun's summit crater were emitted on 10 May and rose a maximum height of 1.5 km. During 10-12 May, occasional roaring and rumbling noises were reported by villagers on the SE and S sides of the volcano. Weak fluctuating incandescence was also seen by people on the S side.

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 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.

Source: Rabaul Volcano Observatory (RVO)