Report on Witori (Papua New Guinea) — December 2003
Bulletin of the Global Volcanism Network, vol. 28, no. 12 (December 2003)
Managing Editor: Richard Wunderman.
Witori (Papua New Guinea) All vents still degassing; low seismicity (5-7 VT earthquakes per day)
Please cite this report as:
Global Volcanism Program, 2003. Report on Witori (Papua New Guinea) (Wunderman, R., ed.). Bulletin of the Global Volcanism Network, 28:12. Smithsonian Institution.
Papua New Guinea
5.576°S, 150.516°E; summit elev. 724 m
All times are local (unless otherwise noted)
Pago remained quiet, with all vents continuing to release weak, thin white vapor during 10 October-14 December 2003. Seismicity was generally low, with daily averages of 5-7 small volcano-tectonic earthquakes. The highest number of daily events through 26 November were the 45 recorded on 28 October.
Geological Summary. 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, Rabaul Volcano Observatory (RVO), P.O. Box 386, Rabaul, Papua New Guinea.