Discovery of rare lava lake on remote sub-Antarctic island

Discovery of rare lava lake on remote sub-Antarctic island
False colour Landsat 8 satellite image of Saunders Island and the lava lake within the crater of Mount Michael (image acquired 31/01/2018). Inset map shows the location of Saunders Island. Credit: British Antarctic Survey

A team of scientists has discovered a rare lava lake on a remote and inaccessible sub-Antarctic island. There are around 1500 land-based volcanoes on Earth, but despite the popular perception of steaming bubbling lava pools in their craters this volcano in the South Sandwich Islands is only the 8th to be identified worldwide to have a persistent lava lake.

The discovery on Mount Michael on Saunders Island, reported this month (July 2019) in the journal Volcanology and Geothermal Research, was made using and is the first to be identified within the British overseas territory, South Georgia and the South Sandwich Islands. In 2001, analysis of low-resolution satellite data revealed a geothermal anomaly but could not prove the existence of a lava lake. Now higher-resolution satellite images from 2003-2018 and advanced processing techniques have revealed a lake 90-215 metres in diameter with of 989-1279 °C present throughout this period.

Author and geologist, Dr. Alex Burton-Johnson from British Antarctic Survey, says:

"We are delighted to have discovered such a remarkable geological feature in the British Overseas Territory. Identifying the lava lake has improved our understanding of the volcanic activity and hazard on this , and tells us more about these rare features, and finally, it has helped us develop techniques to monitor volcanoes from space."

Discovery of rare lava lake on remote sub-Antarctic island
Aerial photograph of Mount Michael. Credit: Pete Bucktrout (British Antarctic Survey)

Lead author Danielle Gray from University College London says:

"Mount Michael is a volcano on a remote island in the Southern Ocean. It is extremely difficult to access, and without high-resolution satellite imagery it would have been very challenging to learn more about this amazing geological feature."

The other seven lakes around the world are: Nyiragongo Volcano DR Congo; Erta Ale Volcano, Ethiopia; Mt Erebus, Antarctica; Mt Yasur Vanuatu; Kilauea, Hawaii and Ambrym, Vanuatu; Masaya, Nicaragua.


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More information: D.M. Gray et al. Evidence for a lava lake on Mt. Michael volcano, Saunders Island (South Sandwich Islands) from Landsat, Sentinel-2 and ASTER satellite imagery, Journal of Volcanology and Geothermal Research (2019). DOI: 10.1016/j.jvolgeores.2019.05.002
Citation: Discovery of rare lava lake on remote sub-Antarctic island (2019, July 3) retrieved 23 July 2019 from https://phys.org/news/2019-07-discovery-rare-lava-lake-remote.html
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