We found the hidden force that created two chains of underwater volcanoes running side by side

By Ben Mather, ARC Early Career Industry Fellow, School of Geography, Earth and Atmospheric Sciences, The University of Melbourne
Maria Seton, Associate Professor, School of Geosciences, University of Sydney

Lord Howe Island sits about 600 kilometres off the New South Wales coast, a crescent of rainforest and sea cliffs that draws visitors for its spectacular beaches and its unique birdlife. Few realise they are standing on the weathered remains of a volcano.

And that volcano has family.

Lord Howe is part of a chain of islands, called “seamounts”. It is the only island above sea level – the rest are submerged in the Tasman Sea. Roughly 650 kilometres west runs a second chain, the Tasmantid seamounts, tracing almost the same path.

Two nearly identical chains side…

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