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Volcanic core of Niue Island, southwest Pacific Ocean

Created 16/10/2025

Updated 16/10/2025

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The results of a gravity and magnetic survey of Niue Island, a raised atoll in the southwest Pacific Ocean, indicate that volcanic rocks underlie the coral limestone capping at a depth of 300-400 m below sea level. A roughly flat-topped, dome-shaped dense volcanic core, is present beneath the southwest of the island. The core has a lateral density contrast of 0.20 t/m3 and a reverse magnetisation of 3.0 A/m, and is believed to be of basaltic composition. An early-middle Miocene age is inferred for the volcanic pedestal. The asymmetric location of the core within the island is thought to be evidence for large-scale landslide activity, particularly on the west and south flanks of the seamount.

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Additional Info

Field Value
Title Volcanic core of Niue Island, southwest Pacific Ocean
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/en/dataset/b831b3f2-bd97-41a7-97c8-329f840585c7
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        177.45,
        -28.2
      ],
      [
        157.23,
        -28.2
      ],
      [
        157.23,
        -11.9
      ],
      [
        177.45,
        -11.9
      ],
      [
        177.45,
        -28.2
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Volcanic core of Niue Island, southwest Pacific Ocean". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/volcanic-core-of-niue-island-southwest-pacific-ocean