Report on Krummel-Garbuna-Welcker (Papua New Guinea) — 19 October-25 October 2005
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 19 October-25 October 2005
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2005. Report on Krummel-Garbuna-Welcker (Papua New Guinea). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 19 October-25 October 2005. Smithsonian Institution and US Geological Survey.
Papua New Guinea
5.416°S, 150.027°E; summit elev. 564 m
All times are local (unless otherwise noted)
RVO reported that visually Garbuna remained unchanged on 22 October from it's condition during the previous days, with moderate-to-thick "white fume" billowing from two vents. A banging noise from the summit region was heard on the evening of 21 October in the nearby towns of Walindi and Kimbe. The scent of sulfur was noted in Sisi village. Seismicity increased slightly, but remained at low levels. Small high-frequency events were common. Based on information from RVO, the Darwin VAAC reported that a minor ash cloud emitted from the volcano on 24 October rose a few hundred meters above the summit
Geologic Background. The basaltic-to-dacitic Krummel-Garbuna-Welcker Volcanic Complex consists of three volcanic peaks located along a 7-km N-S line above a shield-like foundation at the southern end of the Willaumez Peninsula. The central and lower peaks of the centrally located Garbuna contain a large vegetation-free area that is probably the most extensive thermal field in Papua New Guinea. A prominent lava dome and blocky lava flow in the center of thermal area have resisted destruction by thermal activity, and may be of Holocene age. Krummel volcano at the south end of the group contains a summit crater, breached to the NW. The highest peak of the group is Welcker volcano, which has fed blocky lava flows that extend to the eastern coast of the peninsula. The last major eruption from both it and Garbuna volcanoes took place about 1800 years ago. The first historical eruption took place at Garbuna in October 2005.
Sources: Rabaul Volcano Observatory (RVO), Darwin Volcanic Ash Advisory Centre (VAAC)