science behind how this field is generated is not fully understood. Even the theory of plate tectonics – the mechanism behind continental drift that causes earthquakes and volcanoes – was not generally accepted until after the First World War.
Now data from hundreds of major earthquakes has helped a team led by Doyeon Kim at the University of Maryland in the US discover a strange new structure beneath the Marquesas Islands in the South Pacific Ocean.
The structure, known as an ultra-low velocity zone (ULVZ), is about 620 miles in diameter and just under 16 kilometres thick, says Kim.A similar, even larger structure exists beneath Hawaii.These gigantic and mysterious structures are especially interesting because they date back to the period.
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