Report on Rabaul (Papua New Guinea) — 5 March-11 March 2003
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 5 March-11 March 2003
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2003. Report on Rabaul (Papua New Guinea). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 5 March-11 March 2003. Smithsonian Institution and US Geological Survey.
Papua New Guinea
4.271°S, 152.203°E; summit elev. 688 m
All times are local (unless otherwise noted)
The eruption at Rabaul caldera's Tavurvur cone continued during 26 February to 2 March. Activity was characterized by discrete, slow, convoluted ash plumes occurring at long, irregular intervals and rising slowly to several hundred to a thousand meters above the summit. Activity during the report period was slightly lower than activity during 17-26 February, with intervals between ash emissions becoming much longer. Ash emissions were blown to the E and SE. Seismicity remained at low levels and there were no significant changes in deformation. According to the Darwin VAAC, ash was not visible on satellite imagery.
Geologic Background. The low-lying Rabaul caldera on the tip of the Gazelle Peninsula at the NE end of New Britain forms a broad sheltered harbor utilized by what was the island's largest city prior to a major eruption in 1994. The outer flanks of the 688-m-high asymmetrical pyroclastic shield volcano are formed by thick pyroclastic-flow deposits. The 8 x 14 km caldera is widely breached on the east, where its floor is flooded by Blanche Bay and was formed about 1400 years ago. An earlier caldera-forming eruption about 7100 years ago is now considered to have originated from Tavui caldera, offshore to the north. Three small stratovolcanoes lie outside the northern and NE caldera rims. Post-caldera eruptions built basaltic-to-dacitic pyroclastic cones on the caldera floor near the NE and western caldera walls. Several of these, including Vulcan cone, which was formed during a large eruption in 1878, have produced major explosive activity during historical time. A powerful explosive eruption in 1994 occurred simultaneously from Vulcan and Tavurvur volcanoes and forced the temporary abandonment of Rabaul city.