Whakaari / White Island

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Whakaari/White Island
Whakaari (Māori)
White Island cropped.jpg
Whakaari/White Island, Bay of Plenty, New Zealand
Elevation 321 m (1,053 ft)
Prominence 321 m (1,053 ft)
Location
Whakaari/White Island is located in New Zealand
Whakaari/White Island
Whakaari/White Island
Location of Whakaari/White Island
Location Bay of Plenty, North Island, New Zealand
Coordinates 37°31′S 177°11′E / 37.517°S 177.183°E / -37.517; 177.183Coordinates: 37°31′S 177°11′E / 37.517°S 177.183°E / -37.517; 177.183
Geology
Type Stratovolcano
Volcanic arc/belt Taupo Volcanic Zone
Last eruption 2012 to 2013

Whakaari/White Island is an active andesite stratovolcano, situated 48 km (30 mi) from the east coast of the North Island of New Zealand, in the Bay of Plenty. It is New Zealand’s most active cone volcano, and has been built up by continuous volcanic activity over the past 150,000 years.[1] The nearest mainland towns are Whakatane and Tauranga. White Island has been in a near continuous stage of smoking since it was first discovered by James Cook in 1769.

The island is roughly circular, about 2 km (1.2 mi) in diameter, and rises to a height of 321 m (1,053 ft) above sea level. However this is only the peak of a much larger submarine mountain, which rises up to 1,600 m (5,249 ft) above the nearby seafloor, making this volcanic structure the largest in New Zealand.

Sulphur mining was attempted but was abandoned in 1914 after a lahar killed all 10 workers. The main activities on the island now are guided tours and scientific research.

Main vent of Whakaari/White Island in 2000

Volcanology[edit]

Whakaari's eruptions have produced both lava flows and explosive eruptions of ash. It is New Zealand's only active marine volcano and perhaps the most accessible on Earth, attracting scientists and volcanologists worldwide as well as many tourists. It is part of the Taupo Volcanic Zone.

Eruption plume stretching northeastwards from White Island, June 2000

Volcanologists from the GeoNet Project continually monitor the volcano’s activity via surveillance cameras. Survey pegs, magnetometers and seismograph equipment for early earthquake warnings via radio have also been installed on the crater walls. The island is usually on an alert level rating of 1 or 2 on a scale of 1–5. At most times the volcanic activity is limited to steaming fumaroles and boiling mud. In March 2000, three small vents appeared in the main crater and began belching ash which covered the island in fine grey powder. An eruption on 27 July 2000 blanketed the island with mud and scoria and a new crater appeared. Major eruptions in 1981–83 altered much of the island’s landscape and decimated the extensive pōhutukawa forest. The large crater created at that time now contains a lake, whose level varies substantially. Between July and August 2012 White Island showed signs of increased activity with lake and gas levels rising from inside the crater. On 5 August 2012 a minor eruption occurred,[2] sending ash into the air. More eruptions have followed since.[3]

Continued volcanic activity and tremors on January 25, 2013, suggested another eruption was imminent.[4]

A small eruption occurred on August 20, 2013 at 10.23am, lasting for 10 minutes and producing mostly steam. According to the New Zealand Herald newspaper, "Civil Defence will monitor White Island (Whakari) following a small eruption which could be part of a sequence leading to a bigger event."[5]

History[edit]

Corroding machinery at old sulphur mine

The full Māori name for the island is 'Te Puia o Whakaari', meaning 'The Dramatic Volcano.' It was named 'White Island' by Captain Cook on October 1, 1769 because it always appeared to be in a cloud of white steam. Although Cook went close to the island he failed to notice that it was a volcano. Its official name is Whakaari/White Island although it is best known as White Island.

Attempts were made in the mid-1880s, 1898–1901 and 1913-1914 to mine sulphur from White Island but the last of these came to a halt in September 1914, when part of the western crater rim collapsed, creating a lahar which killed all 10 workers.[6] They disappeared without trace, and only a camp cat survived. He was found some days afterwards by the resupply ship, and dubbed "Peter the Great".[7][8] Some years later in 1923 mining was again attempted, but learning from the 1914 disaster, the miners built their huts on a flat part of the island near a gannet colony. Each day they would lower their boat into the sea from a gantry, and row around to the mining factory wharf in Crater Bay. If the sea was rough they had to clamber around the rocks on a very narrow track on the crater’s edge. Before the days of antibiotics, sulphur was used in medicines as an antibacterial agent, in the making of match heads, and for sterilising wine corks. The miner’s diggings were handled in small rail trucks to the crushing and bagging process in the factory built on the island. Unfortunately, there was not enough sulphur at Whakaari and so the ground-up rock was used as a component of agricultural fertiliser. Eventually the mining ended in the 1930s because of the poor mineral content in the fertiliser. The remains of the buildings can still be seen, much corroded by the sulphuric gases.

Important Bird Area[edit]

The island has been identified as an Important Bird Area by BirdLife International because of its breeding colony of about 3000 pairs of Australasian Gannets.[9]

Access[edit]

Visitors approaching the wharf

White Island is privately owned. It was declared a private scenic reserve in 1953 and is subject to the provision of the Reserves Act 1977. Visitors cannot land without permission or remove or disturb any wildlife and must leave only their footprints. However, it is easily accessible by authorised tourist operators. Weather permitting, a luxury motor launch leaves Whakatane daily for a six-hour day trip. Helicopter and aeroplane trips are available from Rotorua, Tauranga and Whakatane.

The waters surrounding White Island are well known for their fishing. Yellowtail kingfish abound all year round, and there is deep water fishing for hapuka and bluenose (a type of warehou) in the winter and blue, black and striped marlin and yellowfin tuna in the summer. A small charter fleet offering day trips and overnight or longer trips operates from the nearby port at Whakatane.

Dino[edit]

In May 2004 a Dino figurine was glued to a rock in front of the Geonet volcano camera on the island. Geonet decided not to have it removed, assuming it was a plastic toy and would not survive long in the corrosive environment.[10] As of August 11, 2013, the figurine was still present and did not appear visibly degraded.[11]

According to Craig Miller, the GeoNet Volcano Network Coordinator, the environment around the volcano has been relatively benign, even to the point that vegetation has been regrowing since the last eruptions in 2000, which may explain why the toy is still in good condition.[12] Another possible scenario is that the figurine is made out of porcelain[13] and as such would not be affected by any corrosive gasses.

Sometime between July 23 and July 24, 2009, the Dino figure was moved to another location on camera.

See also[edit]

Notes[edit]

  1. ^ "White Island". GeoNet. Retrieved 30 December 2012. 
  2. ^ "Visitors warned off erupting volcano". stuff.co.nz. Retrieved 10 August 2012. 
  3. ^ "Ash from White Island volcano sprinkles Papamoa". nzherald.co.nz. 9 August 2012. Retrieved 10 August 2012. 
  4. ^ "White Island eruption increasingly likely". 3 News NZ. January 25, 2013. 
  5. ^ "Civil Defence monitor White Island volcano - National - NZ Herald News". The New Zealand Herald. 20 August 2013. 
  6. ^ Boon, Kevin. "The 1914 White Island eruption". URL accessed 4 December 2007. (Archived by WebCite at http://www.webcitation.org/5TqkjKdYS)
  7. ^ Sarah Lowe and Kim Westerskov (1993). "Steam and brimstone", New Zealand Geographic 17, 82-106.
  8. ^ Norton, Amelia. "White Island: Where Nature Reigns Supreme". Four Corners. Retrieved 17 November 2009. 
  9. ^ BirdLife International. (2012). Important Bird Areas factsheet: White Island (Whakaari). Downloaded from http://www.birdlife.org on 2012-02-02.
  10. ^ ABC News Online. Volcanologists spy pink 'dinosaur' on remote webcam. Accessed 4 December 2007. (Archived by WebCite at http://www.webcitation.org/5TqlCycX5)
  11. ^ White Island volcano camera, Geonet. Accessed 16 October 2008.
  12. ^ The Press. White Island dino survives. Accessed 31 August 2009
  13. ^ http://www.goantiques.com Beswick Figure 'DINO'. Accessed 24 August 2008.

References[edit]

External links[edit]