Report on Witori (Papua New Guinea) — February 2006
Bulletin of the Global Volcanism Network, vol. 31, no. 2 (February 2006)
Managing Editor: Richard Wunderman.
Witori (Papua New Guinea) Quiescent, with minor seismicity, through March 2006
Please cite this report as:
Global Volcanism Program, 2006. Report on Witori (Papua New Guinea) (Wunderman, R., ed.). Bulletin of the Global Volcanism Network, 31:2. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN200602-252080.
Papua New Guinea
5.576°S, 150.516°E; summit elev. 724 m
All times are local (unless otherwise noted)
Since 18 September 2005 (BGVN 30:09) through 31 March 2006, Pago has remained quiet. Only small volumes of diffuse white vapor released from all vents have been observed, with no noises or glow. Between 16 February and 31 March low-frequency earthquakes were recorded at a rate of 1-4 per day. The daily number of high-frequency events during that period ranged from 7 to 26.
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, Rabaul Volcano Observatory (RVO), P.O. Box 386, Rabaul, Papua New Guinea; Andrew Tupper, Darwin Volcanic Ash Advisory Centre (VAAC), Bureau of Meteorology, Northern Territory Regional Office, PO Box 40050, Casuarina, Northern Territory 0811, Australia (URL: http://www.bom.gov.au/info/vaac/).