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


Witori

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.

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.

Geological Summary. The Witori caldera (5.5 x 7.5 km) on the northern coast of central New Britain contains the active Pago cone. The Buru caldera cuts the SW flank. The gently sloping outer flanks consist primarily of dacitic pyroclastic-flow and airfall deposits produced during a series of five major explosive eruptions from about 5,600 to 1,200 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; it has grown to a height above 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