Report on Whakaari/White Island (New Zealand) — August 1999
Bulletin of the Global Volcanism Network, vol. 24, no. 8 (August 1999)
Managing Editor: Richard Wunderman.
Whakaari/White Island (New Zealand) 26 July visit reveals new erupting vent but no major ash accumulation
Please cite this report as:
Global Volcanism Program, 1999. Report on Whakaari/White Island (New Zealand) (Wunderman, R., ed.). Bulletin of the Global Volcanism Network, 24:8. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN199908-241040.
37.52°S, 177.18°E; summit elev. 294 m
All times are local (unless otherwise noted)
Several aircraft operators reported a plume extending 3 km above the island on 23 July. Tour operators noted that the ash ceased emitting after 0830 on 25 July. On 26 July steam and gas was observed over 40 km downwind of the volcano, and a visit by scientists indicated that minor activity had commenced from a new vent to the S of those active earlier this year. Thus, the source of the ash cloud was neither PeeJay vent nor the vent immediately E of it. Although the new, active vent emitted ash continuously, there was not evidence of significant ash accumulation.
Geologic Background. The uninhabited Whakaari/White Island is the 2 x 2.4 km emergent summit of a 16 x 18 km submarine volcano in the Bay of Plenty about 50 km offshore of North Island. The island consists of two overlapping andesitic-to-dacitic stratovolcanoes. The SE side of the crater is open at sea level, with the recent activity centered about 1 km from the shore close to the rear crater wall. Volckner Rocks, sea stacks that are remnants of a lava dome, lie 5 km NW. Descriptions of volcanism since 1826 have included intermittent moderate phreatic, phreatomagmatic, and Strombolian eruptions; activity there also forms a prominent part of Maori legends. The formation of many new vents during the 19th and 20th centuries caused rapid changes in crater floor topography. Collapse of the crater wall in 1914 produced a debris avalanche that buried buildings and workers at a sulfur-mining project. Explosive activity in December 2019 took place while tourists were present, resulting in many fatalities. The official government name Whakaari/White Island is a combination of the full Maori name of Te Puia o Whakaari ("The Dramatic Volcano") and White Island (referencing the constant steam plume) given by Captain James Cook in 1769.
Information Contacts: Brad Scott, Wairakei Research Center, Institute of Geological and Nuclear Sciences (IGNS), Private Bag 2000, Wairakei, New Zealand (URL: http://www.gns.cri.nz/).