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Report on Witori (Papua New Guinea) — 25 September-1 October 2002


Witori

Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
25 September-1 October 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, 25 September-1 October 2002. Smithsonian Institution and US Geological Survey.

Weekly Report (25 September-1 October 2002)

Witori

Papua New Guinea

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

All times are local (unless otherwise noted)


As of 30 September seismicity remained at low levels at Pago and lava continued to flow from the northeastern-most vent of the fissure system. A significant lava field had developed, with all lava flows contained within the caldera. Incandescence was visible at the lava-flow front.

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.

Sources: US Geological Survey, The National