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Report on Witori (Papua New Guinea) — 2 May-8 May 2012


Witori

Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
2 May-8 May 2012
Managing Editor: Sally Kuhn Sennert

Please cite this report as:

Global Volcanism Program, 2012. Report on Witori (Papua New Guinea). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 2 May-8 May 2012. Smithsonian Institution and US Geological Survey.

Weekly Report (2 May-8 May 2012)

Witori

Papua New Guinea

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

All times are local (unless otherwise noted)


Based on analyses of satellite imagery, the Darwin VAAC reported that ash-and-steam plumes from Pago rose to an altitude of 13.7 km (45,000 ft) a.s.l. and drifted 75 km NE on 3 May.

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: Darwin Volcanic Ash Advisory Centre (VAAC)