Report on Ulawun (Papua New Guinea) — 2 June-8 June 2010

Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 2 June-8 June 2010
Managing Editor: Sally Kuhn Sennert

Please cite this report as:

Global Volcanism Program, 2010. Report on Ulawun (Papua New Guinea). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 2 June-8 June 2010. Smithsonian Institution and US Geological Survey.

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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)


RVO reported that during 2-7 June occasional low roaring or rumbling noises from Ulawun were heard daily in areas on the ESE, SE, and S flanks. During 2-5 June white vapor plumes rose 800-900 m high. Very fine ash particles fell in Ulamona about 10 km NW on 3 June and some gray emissions rose from the volcano on 5 June. Emissions during 6-9 June were white and light gray, and continued to rise no higher than 900 m. Fluctuating incandescence from the crater was seen at night from the S side of the volcano. Ashfall was again reported in Ulamona on 8 June.

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.

Source: Rabaul Volcano Observatory (RVO)