Report on Witori (Papua New Guinea) — September 2005
Bulletin of the Global Volcanism Network, vol. 30, no. 9 (September 2005)
Managing Editor: Richard Wunderman.
Witori (Papua New Guinea) Steaming, and few earthquakes, during field observations in September 2005
Please cite this report as:
Global Volcanism Program, 2005. Report on Witori (Papua New Guinea) (Wunderman, R., ed.). Bulletin of the Global Volcanism Network, 30:9. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN200509-252080.
Papua New Guinea
5.576°S, 150.516°E; summit elev. 724 m
All times are local (unless otherwise noted)
During the observation interval 12-18 September 2005, Pago continued to be quiet. Very small volumes of thin white vapor were released from all vents. No noises were heard and no glow was observed. Seismic activity was low, with some small, high frequency earthquakes being recorded. The highest number of high frequency events on any given day was 3, recorded on 18 September.
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.
Information Contacts: Ima Itikarai and Herman Patia, Rabaul Volcano Observatory (RVO), PO Box 386, Rabaul, Papua New Guinea.