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Report on Witori (Papua New Guinea) — 27 November-3 December 2002

Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 27 November-3 December 2002
Managing Editor: Gari Mayberry

Please cite this report as:

Global Volcanism Program, 2002. Report on Witori (Papua New Guinea). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 27 November-3 December 2002. Smithsonian Institution and US Geological Survey.

Volcano Profile |  Weekly Report (27 November-3 December 2002)


Witori

Papua New Guinea

5.576°S, 150.516°E; summit elev. 724 m

All times are local (unless otherwise noted)


RVO reported that Pago continued to erupt through 2 December. Slow lava effusion from the northwestern-most vent continued, with the lava flow still contained within the Witori Caldera floor. Variable amounts of white vapor continued to be released from the vents. The northwestern-most vent released bluish vapor, indicating and/or confirming continuing lava effusion. Seismicity, consisting of small volcanotectonic earthquakes, remained at normal background levels. RVO stated that results from data analysis did not indicate a major increase in eruptive activity.

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) via the Darwin Volcanic Ash Advisory Center