Report on Witori (Papua New Guinea) — 7 April-13 April 2004
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 7 April-13 April 2004
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2004. Report on Witori (Papua New Guinea). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 7 April-13 April 2004. Smithsonian Institution and US Geological Survey.
Papua New Guinea
5.576°S, 150.516°E; summit elev. 724 m
All times are local (unless otherwise noted)
During 15 March to 1 April, volcanic and seismic activity at Pago remained at low levels. All vents gently released small volumes of "thin white vapor." On some days, small amounts of "blue vapor" were emitted from the lower vents. A dull glow was observed at the volcano on 17 March.
Geologic Background. The 5.5 x 7.5 km Witori caldera on the northern coast of central New Britain contains the young historically active cone of Pago. The Buru caldera cuts the SW flank of Witori volcano. The gently sloping outer flanks of Witori volcano consist primarily of dacitic pyroclastic-flow and airfall deposits produced during a series of five major explosive eruptions from about 5600 to 1200 years ago, many of which may have been associated with caldera formation. The post-caldera Pago cone may have formed less than 350 years ago. Pago has grown to a height above that of the Witori caldera rim, and a series of ten dacitic lava flows from it covers much of the caldera floor. The youngest of these was erupted during 2002-2003 from vents extending from the summit nearly to the NW caldera wall.
Source: Rabaul Volcano Observatory (RVO)